diff --git a/ch11/model.py b/ch11/model.py
index ad5a30b..194e07c 100644
--- a/ch11/model.py
+++ b/ch11/model.py
@@ -1,19 +1,29 @@
+import random
+
 height = 100
 width = 100
 
+def randomize(grid, width, height):
+    for i in range(0, height):
+        for j in range(0, width):
+            grid[i][j] = random.randint(0, 1)
+
 grid_model = [0] * height
+next_grid_model = [0] * height
 
 for i in range(height):
     grid_model[i] = [0] * width
+    next_grid_model[i] = [0] * width
 
+randomize(grid_model, width, height)
 
 def next_gen():
-    global grid_model
+    global grid_model, next_grid_model
 
     for i in range(0, height):
         for j in range(0, width):
             cell = 0
-            print('Проверяем клетку', i, j)
+            # print('Проверяем клетку', i, j)
             count = count_neighbors(grid_model, i, j)
 
             if grid_model[i][j] == 0:
@@ -22,6 +32,11 @@ def next_gen():
             elif grid_model[i][j] == 1:
                 if count == 2 or count == 3:
                     cell = 1
+            next_grid_model[i][j] = cell
+            # print('Новое значение:', next_grid_model[i][j])
+    temp = grid_model
+    grid_model = next_grid_model
+    next_grid_model = temp
 
 
 def count_neighbors(grid, row, col):