diff --git a/Life/App.xaml b/Life/App.xaml
index 0dc76a5..7acb8d2 100644
--- a/Life/App.xaml
+++ b/Life/App.xaml
@@ -13,5 +13,8 @@
              <Setter Property="FontSize" Value="24" />
              <Setter Property="FontWeight" Value="Black"/>
          </Style>
+         <Style x:Key="Setting" TargetType="Panel">
+             <Setter Property="Margin" Value="0 0 0 8"></Setter>
+         </Style>
     </Application.Resources>
 </Application>
diff --git a/Life/Automaton/GameOfLife.cs b/Life/Automaton/GameOfLife.cs
index ac5e891..57beb4b 100644
--- a/Life/Automaton/GameOfLife.cs
+++ b/Life/Automaton/GameOfLife.cs
@@ -40,6 +40,11 @@ namespace Life.Automaton
                 
                 return @new;
             }
+
+            public override string ToString()
+            {
+                return $"{born}/{survive}";
+            }
         }
         
         public GameOfLife(int width, int height)
diff --git a/Life/Automaton/IAutomaton.cs b/Life/Automaton/IAutomaton.cs
index 61790df..df23428 100644
--- a/Life/Automaton/IAutomaton.cs
+++ b/Life/Automaton/IAutomaton.cs
@@ -6,6 +6,7 @@ namespace Life.Automaton
     {
         int Iteration { get; }
         IField Field { get; }
+        IRule Rule { get; set; }
 
         void Advance();
 
diff --git a/Life/MainWindow.xaml b/Life/MainWindow.xaml
index c306aba..0fd2741 100644
--- a/Life/MainWindow.xaml
+++ b/Life/MainWindow.xaml
@@ -30,13 +30,13 @@
             <GridSplitter Grid.Column="1" Width="3" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"/>
             
             <StackPanel Orientation="Vertical" Margin="8" Grid.Column="2" HorizontalAlignment="Stretch">
-                <DockPanel Margin="0 0 0 8"> 
+                <DockPanel Style="{StaticResource Setting}"> 
                     <TextBlock Style="{StaticResource Header}" VerticalAlignment="Center">Iteration</TextBlock>
                     <TextBlock Style="{StaticResource Value}" Text="{Binding Iteration}" HorizontalAlignment="Stretch"/>
                     <Button VerticalAlignment="Stretch" Command="{Binding StepCommand}" CommandParameter="{Binding Steps}" DockPanel.Dock="Right" HorizontalAlignment="Right" Padding="8">step</Button>
                     <TextBox Text="{Binding Steps}" VerticalAlignment="Stretch" HorizontalAlignment="Right" DockPanel.Dock="Right" Padding="8" BorderThickness="1 1 0 1"/>
                 </DockPanel>
-                <DockPanel HorizontalAlignment="Stretch" Margin="0 0 0 8"> 
+                <DockPanel Style="{StaticResource Setting}"> 
                     <TextBlock Style="{StaticResource Header}" VerticalAlignment="Center" DockPanel.Dock="Left">Size</TextBlock>
                     <StackPanel Orientation="Horizontal" HorizontalAlignment="Stretch" VerticalAlignment="Center">
                         <TextBox Text="{Binding Width, Mode=TwoWay}"/>
@@ -47,10 +47,14 @@
                         <TextBlock Margin="2">change</TextBlock>
                     </Button>
                 </DockPanel>
-                <DockPanel HorizontalAlignment="Stretch"> 
+                <DockPanel Style="{StaticResource Setting}"> 
                     <TextBlock Style="{StaticResource Header}" VerticalAlignment="Center" DockPanel.Dock="Left">Cell Size</TextBlock>
                     <Slider Minimum="8" Maximum="32" Value="{Binding Size}" VerticalAlignment="Center" />
                 </DockPanel>
+                <DockPanel Style="{StaticResource Setting}"> 
+                    <TextBlock Style="{StaticResource Header}" VerticalAlignment="Center" DockPanel.Dock="Left">Rule (born/survive)</TextBlock>
+                    <TextBox Text="{Binding Rule, Mode=TwoWay}" HorizontalAlignment="Right" Padding="8"/>
+                </DockPanel>
             </StackPanel>
         </Grid>
     </DockPanel>
diff --git a/Life/ViewModel/AutomatonViewModel.cs b/Life/ViewModel/AutomatonViewModel.cs
index 5e68e3e..26ea3e4 100644
--- a/Life/ViewModel/AutomatonViewModel.cs
+++ b/Life/ViewModel/AutomatonViewModel.cs
@@ -16,6 +16,8 @@ namespace Life.ViewModel
         private int _width;
         private int _height;
         private int _steps;
+        private string _rule = "3/23";
+        
         private IAutomaton _automaton;
         private IFormatter _formatter = new BinaryFormatter();
 
@@ -31,6 +33,20 @@ namespace Life.ViewModel
             };
         }
 
+        public string Rule
+        {
+            get => _rule;
+            set
+            {
+                _rule = value;
+
+                var split = value.Split("/");
+                
+                Automaton.Rule = new GameOfLife.StandardRule(split[0], split[1] ?? "23");
+                OnPropertyChanged(nameof(Rule));
+            }
+        }
+        
         public int Size
         {
             get => _size;
@@ -79,6 +95,7 @@ namespace Life.ViewModel
                 _automaton = value;
                 OnPropertyChanged(nameof(Field));
                 OnPropertyChanged(nameof(Iteration));
+                Rule = Automaton.Rule.ToString();
             }
         }