diff --git a/HomeWork.cs b/HomeWork.cs
index 821b44c..1e400ef 100644
--- a/HomeWork.cs
+++ b/HomeWork.cs
@@ -335,6 +335,21 @@
 
             return snakeArray;
         }
+        
+        public int Task_64(int number)
+        {
+            if (number / 10 != 0)
+                return 1 + Task_64(number / 10);
+            return 1;
+        }
+
+        public int Task_66(int M, int N)
+        {
+            if (N == M-1)
+                return 0;
+            return N + Task_66(M, N-1);
+
+        }
 
 
 
diff --git a/README.md b/README.md
index 7a08b79..883cbdc 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,8 @@
 - [X] Task_54
 - [X] Task_56
 - [X] Task_62
+
+
+## HW9
+- [X] Task_64
+- [X] Task_66
diff --git a/Start.cs b/Start.cs
index ed6c451..ab352d5 100644
--- a/Start.cs
+++ b/Start.cs
@@ -37,7 +37,7 @@ public class Start
         Tools myTools = new Tools();
 
         Console.Write("Wich task: ");
-        Console.WriteLine("WH8 is 54, 56, 62");
+        Console.WriteLine("WH9 is 64, 66");
 //        Console.WriteLine("WH3 is 19, 23");
         int taskNumver = Convert.ToInt32(Console.ReadLine());
         switch (taskNumver)
@@ -175,6 +175,20 @@ public class Start
                 int n = Convert.ToInt32(Console.ReadLine());
                 myTools.ShowInt2dArray(HW.Task_62(n));
                 break;
+            
+            case 64:
+                Console.WriteLine("Input number: ");
+                int number64 = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Count numbers is: "+HW.Task_64(number64));
+                break;
+            
+            case 66:
+                Console.WriteLine("Input M: ");
+                int M = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input N: ");
+                int N = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Summ is: "+HW.Task_66(M, N)+ $" between numbers {M} and {N} ");
+                break;
 
             
             
diff --git a/bin/Debug/net6.0/programming_GB.dll b/bin/Debug/net6.0/programming_GB.dll
index 3d33734..910405e 100644
Binary files a/bin/Debug/net6.0/programming_GB.dll and b/bin/Debug/net6.0/programming_GB.dll differ
diff --git a/bin/Debug/net6.0/programming_GB.pdb b/bin/Debug/net6.0/programming_GB.pdb
index 7ae54a8..5758608 100644
Binary files a/bin/Debug/net6.0/programming_GB.pdb and b/bin/Debug/net6.0/programming_GB.pdb differ
diff --git a/obj/Debug/net6.0/programming_GB.dll b/obj/Debug/net6.0/programming_GB.dll
index 3d33734..910405e 100644
Binary files a/obj/Debug/net6.0/programming_GB.dll and b/obj/Debug/net6.0/programming_GB.dll differ
diff --git a/obj/Debug/net6.0/programming_GB.pdb b/obj/Debug/net6.0/programming_GB.pdb
index 7ae54a8..5758608 100644
Binary files a/obj/Debug/net6.0/programming_GB.pdb and b/obj/Debug/net6.0/programming_GB.pdb differ
diff --git a/obj/Debug/net6.0/ref/programming_GB.dll b/obj/Debug/net6.0/ref/programming_GB.dll
index 3f3b717..62a04fe 100644
Binary files a/obj/Debug/net6.0/ref/programming_GB.dll and b/obj/Debug/net6.0/ref/programming_GB.dll differ
diff --git a/obj/Debug/net6.0/refint/programming_GB.dll b/obj/Debug/net6.0/refint/programming_GB.dll
index 3f3b717..62a04fe 100644
Binary files a/obj/Debug/net6.0/refint/programming_GB.dll and b/obj/Debug/net6.0/refint/programming_GB.dll differ