diff --git a/DNA/DNA.xcodeproj/project.pbxproj b/DNA/DNA.xcodeproj/project.pbxproj
new file mode 100644
index 00000000..a333af1e
--- /dev/null
+++ b/DNA/DNA.xcodeproj/project.pbxproj
@@ -0,0 +1,255 @@
+// !$*UTF8*$!
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+			);
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+
+/* Begin PBXProject section */
+		606CEB941652C87D007BC943 /* Project object */ = {
+			isa = PBXProject;
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+				LastUpgradeCheck = 0450;
+				ORGANIZATIONNAME = "Алексей Потемкин";
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+			compatibilityVersion = "Xcode 3.2";
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+			knownRegions = (
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+			mainGroup = 606CEB921652C87C007BC943;
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+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				606CEB9C1652C87D007BC943 /* DNA */,
+			);
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+				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
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+				ONLY_ACTIVE_ARCH = YES;
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+			name = Debug;
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+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = "$(ARCHS_STANDARD_64_BIT)";
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_OBJC_ARC = YES;
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+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
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+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.8;
+				SDKROOT = macosx;
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+			name = Release;
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+			name = Release;
+		};
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+
+/* Begin XCConfigurationList section */
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+			isa = XCConfigurationList;
+			buildConfigurations = (
+				606CEBAA1652C87D007BC943 /* Debug */,
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+			buildConfigurations = (
+				606CEBAD1652C87D007BC943 /* Debug */,
+				606CEBAE1652C87D007BC943 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 606CEB941652C87D007BC943 /* Project object */;
+}
diff --git a/DNA/DNA.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/DNA/DNA.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 00000000..f6feef27
--- /dev/null
+++ b/DNA/DNA.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:DNA.xcodeproj">
+   </FileRef>
+</Workspace>
diff --git a/DNA/DNA.xcodeproj/project.xcworkspace/xcshareddata/DNA.xccheckout b/DNA/DNA.xcodeproj/project.xcworkspace/xcshareddata/DNA.xccheckout
new file mode 100644
index 00000000..a9c596f2
--- /dev/null
+++ b/DNA/DNA.xcodeproj/project.xcworkspace/xcshareddata/DNA.xccheckout
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDESourceControlProjectFavoriteDictionaryKey</key>
+	<false/>
+	<key>IDESourceControlProjectIdentifier</key>
+	<string>03C01933-9C83-4426-85C5-7176BF1F8D4F</string>
+	<key>IDESourceControlProjectName</key>
+	<string>DNA</string>
+	<key>IDESourceControlProjectOriginsDictionary</key>
+	<dict>
+		<key>738112EB-DFF8-40DE-826B-43BCAA479693</key>
+		<string>https://github.com/potemkinaleksey/osx-project-1.git</string>
+	</dict>
+	<key>IDESourceControlProjectPath</key>
+	<string>DNA/DNA.xcodeproj/project.xcworkspace</string>
+	<key>IDESourceControlProjectRelativeInstallPathDictionary</key>
+	<dict>
+		<key>738112EB-DFF8-40DE-826B-43BCAA479693</key>
+		<string>../../..</string>
+	</dict>
+	<key>IDESourceControlProjectURL</key>
+	<string>https://github.com/potemkinaleksey/osx-project-1.git</string>
+	<key>IDESourceControlProjectVersion</key>
+	<integer>110</integer>
+	<key>IDESourceControlProjectWCCIdentifier</key>
+	<string>738112EB-DFF8-40DE-826B-43BCAA479693</string>
+	<key>IDESourceControlProjectWCConfigurations</key>
+	<array>
+		<dict>
+			<key>IDESourceControlRepositoryExtensionIdentifierKey</key>
+			<string>public.vcs.git</string>
+			<key>IDESourceControlWCCIdentifierKey</key>
+			<string>738112EB-DFF8-40DE-826B-43BCAA479693</string>
+			<key>IDESourceControlWCCName</key>
+			<string>osx-project-1</string>
+		</dict>
+	</array>
+</dict>
+</plist>
diff --git a/DNA/DNA.xcodeproj/project.xcworkspace/xcuserdata/alexp.xcuserdatad/UserInterfaceState.xcuserstate b/DNA/DNA.xcodeproj/project.xcworkspace/xcuserdata/alexp.xcuserdatad/UserInterfaceState.xcuserstate
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index 00000000..64e4da3d
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diff --git a/DNA/DNA.xcodeproj/project.xcworkspace/xcuserdata/ivanrpn.xcuserdatad/UserInterfaceState.xcuserstate b/DNA/DNA.xcodeproj/project.xcworkspace/xcuserdata/ivanrpn.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 00000000..f0bd0364
Binary files /dev/null and b/DNA/DNA.xcodeproj/project.xcworkspace/xcuserdata/ivanrpn.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/DNA.xcscheme b/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/DNA.xcscheme
new file mode 100644
index 00000000..59617b24
--- /dev/null
+++ b/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/DNA.xcscheme
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0500"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+               BuildableName = "DNA"
+               BlueprintName = "DNA"
+               ReferencedContainer = "container:DNA.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
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+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
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+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
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+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/xcschememanagement.plist b/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 00000000..a0aecad4
--- /dev/null
+++ b/DNA/DNA.xcodeproj/xcuserdata/alexp.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>DNA.xcscheme</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+	<key>SuppressBuildableAutocreation</key>
+	<dict>
+		<key>606CEB9C1652C87D007BC943</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/DNA.xcscheme b/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/DNA.xcscheme
new file mode 100644
index 00000000..ab32f3f5
--- /dev/null
+++ b/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/DNA.xcscheme
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0450"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+               BuildableName = "DNA"
+               BlueprintName = "DNA"
+               ReferencedContainer = "container:DNA.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "606CEB9C1652C87D007BC943"
+            BuildableName = "DNA"
+            BlueprintName = "DNA"
+            ReferencedContainer = "container:DNA.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/xcschememanagement.plist b/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 00000000..a0aecad4
--- /dev/null
+++ b/DNA/DNA.xcodeproj/xcuserdata/ivanrpn.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>DNA.xcscheme</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+	<key>SuppressBuildableAutocreation</key>
+	<dict>
+		<key>606CEB9C1652C87D007BC943</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/DNA/DNA/Cell+mutator.h b/DNA/DNA/Cell+mutator.h
new file mode 100644
index 00000000..55e21f5b
--- /dev/null
+++ b/DNA/DNA/Cell+mutator.h
@@ -0,0 +1,18 @@
+//
+//  Cell+mutator.h
+//  DNA
+//
+//  Created by Алексей Потемкин on 13.11.12.
+//  Copyright (c) 2012 Алексей Потемкин. All rights reserved.
+//
+
+#include <stdlib.h>
+
+#import "Cell.h"
+
+
+@interface Cell (mutator)
+
+-(void)mutate:(int) percent;
+
+@end
diff --git a/DNA/DNA/Cell+mutator.m b/DNA/DNA/Cell+mutator.m
new file mode 100644
index 00000000..fb829118
--- /dev/null
+++ b/DNA/DNA/Cell+mutator.m
@@ -0,0 +1,21 @@
+//
+//  Cell+mutator.m
+//  DNA
+//
+//  Created by Алексей Потемкин on 13.11.12.
+//  Copyright (c) 2012 Алексей Потемкин. All rights reserved.
+//
+
+#import "Cell+mutator.h"
+
+@implementation Cell (mutator)
+
+-(void)mutate:(int)percent{
+    
+    for (int i = 0; i < percent; ++i) {
+        [self.DNA insertObject:[self.characters objectAtIndex:arc4random() % 4] atIndex:i];
+    }
+    
+}
+
+@end
diff --git a/DNA/DNA/Cell.h b/DNA/DNA/Cell.h
new file mode 100644
index 00000000..d1274bf4
--- /dev/null
+++ b/DNA/DNA/Cell.h
@@ -0,0 +1,21 @@
+//
+//  Cell.h
+//  DNA
+//
+//  Created by Алексей Потемкин on 13.11.12.
+//  Copyright (c) 2012 Алексей Потемкин. All rights reserved.
+//
+
+#include <stdlib.h>
+
+#import <Foundation/Foundation.h>
+
+
+@interface Cell : NSObject
+
+@property (nonatomic, strong) NSMutableArray *DNA;
+@property (nonatomic, strong) NSArray *characters; // Characters for DNA array
+
+-(int)hammingDistance:(Cell *)cell;
+
+@end
diff --git a/DNA/DNA/Cell.m b/DNA/DNA/Cell.m
new file mode 100644
index 00000000..2bd553fc
--- /dev/null
+++ b/DNA/DNA/Cell.m
@@ -0,0 +1,50 @@
+//
+//  Cell.m
+//  DNA
+//
+//  Created by Алексей Потемкин on 13.11.12.
+//  Copyright (c) 2012 Алексей Потемкин. All rights reserved.
+//
+
+#import "Cell.h"
+
+@implementation Cell
+
+@synthesize DNA = _DNA;
+@synthesize characters = _characters;
+
+-(id)init{
+    
+    self = [super init];
+    
+    if (!self) {
+        
+        if (!_DNA) {
+            _DNA = [[NSMutableArray alloc] init];
+        }
+        
+        _characters = [[NSArray alloc] initWithObjects:@"A", @"T", @"G", @"C", nil];
+        
+        for (int i = 0; i < 100; ++i) {
+            [_DNA insertObject:[_characters objectAtIndex:arc4random() % 4] atIndex:i];
+        }
+        
+    }
+    
+    return self;
+}
+
+-(int)hammingDistance:(Cell *)cell{
+    
+    int hammingDistance = 0;
+    
+    for (int i = 0; i < [_DNA count]; ++i) {
+        if (![[_DNA objectAtIndex:i] isEqualTo:[[cell DNA] objectAtIndex:i]]) {
+            hammingDistance++;
+        }
+    }
+    
+    return hammingDistance;
+}
+
+@end
diff --git a/DNA/DNA/DNA-Prefix.pch b/DNA/DNA/DNA-Prefix.pch
new file mode 100644
index 00000000..cd50d540
--- /dev/null
+++ b/DNA/DNA/DNA-Prefix.pch
@@ -0,0 +1,7 @@
+//
+// Prefix header for all source files of the 'DNA' target in the 'DNA' project
+//
+
+#ifdef __OBJC__
+    #import <Foundation/Foundation.h>
+#endif
diff --git a/DNA/DNA/DNA.1 b/DNA/DNA/DNA.1
new file mode 100644
index 00000000..f1a89198
--- /dev/null
+++ b/DNA/DNA/DNA.1
@@ -0,0 +1,79 @@
+.\"Modified from man(1) of FreeBSD, the NetBSD mdoc.template, and mdoc.samples.
+.\"See Also:
+.\"man mdoc.samples for a complete listing of options
+.\"man mdoc for the short list of editing options
+.\"/usr/share/misc/mdoc.template
+.Dd 13.11.12               \" DATE 
+.Dt DNA 1      \" Program name and manual section number 
+.Os Darwin
+.Sh NAME                 \" Section Header - required - don't modify 
+.Nm DNA,
+.\" The following lines are read in generating the apropos(man -k) database. Use only key
+.\" words here as the database is built based on the words here and in the .ND line. 
+.Nm Other_name_for_same_program(),
+.Nm Yet another name for the same program.
+.\" Use .Nm macro to designate other names for the documented program.
+.Nd This line parsed for whatis database.
+.Sh SYNOPSIS             \" Section Header - required - don't modify
+.Nm
+.Op Fl abcd              \" [-abcd]
+.Op Fl a Ar path         \" [-a path] 
+.Op Ar file              \" [file]
+.Op Ar                   \" [file ...]
+.Ar arg0                 \" Underlined argument - use .Ar anywhere to underline
+arg2 ...                 \" Arguments
+.Sh DESCRIPTION          \" Section Header - required - don't modify
+Use the .Nm macro to refer to your program throughout the man page like such:
+.Nm
+Underlining is accomplished with the .Ar macro like this:
+.Ar underlined text .
+.Pp                      \" Inserts a space
+A list of items with descriptions:
+.Bl -tag -width -indent  \" Begins a tagged list 
+.It item a               \" Each item preceded by .It macro
+Description of item a
+.It item b
+Description of item b
+.El                      \" Ends the list
+.Pp
+A list of flags and their descriptions:
+.Bl -tag -width -indent  \" Differs from above in tag removed 
+.It Fl a                 \"-a flag as a list item
+Description of -a flag
+.It Fl b
+Description of -b flag
+.El                      \" Ends the list
+.Pp
+.\" .Sh ENVIRONMENT      \" May not be needed
+.\" .Bl -tag -width "ENV_VAR_1" -indent \" ENV_VAR_1 is width of the string ENV_VAR_1
+.\" .It Ev ENV_VAR_1
+.\" Description of ENV_VAR_1
+.\" .It Ev ENV_VAR_2
+.\" Description of ENV_VAR_2
+.\" .El                      
+.Sh FILES                \" File used or created by the topic of the man page
+.Bl -tag -width "/Users/joeuser/Library/really_long_file_name" -compact
+.It Pa /usr/share/file_name
+FILE_1 description
+.It Pa /Users/joeuser/Library/really_long_file_name
+FILE_2 description
+.El                      \" Ends the list
+.\" .Sh DIAGNOSTICS       \" May not be needed
+.\" .Bl -diag
+.\" .It Diagnostic Tag
+.\" Diagnostic informtion here.
+.\" .It Diagnostic Tag
+.\" Diagnostic informtion here.
+.\" .El
+.Sh SEE ALSO 
+.\" List links in ascending order by section, alphabetically within a section.
+.\" Please do not reference files that do not exist without filing a bug report
+.Xr a 1 , 
+.Xr b 1 ,
+.Xr c 1 ,
+.Xr a 2 ,
+.Xr b 2 ,
+.Xr a 3 ,
+.Xr b 3 
+.\" .Sh BUGS              \" Document known, unremedied bugs 
+.\" .Sh HISTORY           \" Document history if command behaves in a unique manner
\ No newline at end of file
diff --git a/DNA/DNA/main.m b/DNA/DNA/main.m
new file mode 100644
index 00000000..5d06947e
--- /dev/null
+++ b/DNA/DNA/main.m
@@ -0,0 +1,31 @@
+//
+//  main.m
+//  DNA
+//
+//  Created by Алексей Потемкин on 13.11.12.
+//  Copyright (c) 2012 Алексей Потемкин. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "Cell.h"
+#import "Cell+mutator.h"
+
+int main(int argc, const char * argv[])
+{
+
+    @autoreleasepool {
+        
+        Cell *oneCell = [[Cell alloc] init];
+        Cell *anotherCell = [[Cell alloc] init];
+        
+        NSLog(@"Hamming distance before mutation = %d", [oneCell hammingDistance:anotherCell]);
+        
+        [oneCell mutate:10];
+        [anotherCell mutate:30];
+        
+        NSLog(@"Hamming distance after mutation = %d", [oneCell hammingDistance:anotherCell]);
+        
+    }
+    return 0;
+}
+
diff --git a/README.md b/README.md
index 95bf4f65..d4fcc1d9 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,6 @@
 osx-project-1
 =============
 
-## Описание задания [(сдать задание)] (https://u.hexlet.org/courses/4/assignments/5)
 
 1. Создайте новое консольное приложение в XCode.