diff --git a/Form1.vb b/Form1.vb
index 411aff4..ca17a2d 100644
--- a/Form1.vb
+++ b/Form1.vb
@@ -1,64 +1,149 @@
-Public Class Form1
-    Private Sub Label1_Click(sender As Object, e As EventArgs) Handles Label1.Click
+Imports System.DirectoryServices
+Imports System.Security.Cryptography.X509Certificates
+
+Public Class Form1
+    Dim a As Double
+    Dim b As Double
+    Dim result As Double
+    Dim memory As Double = 0
+    Private Sub Label2_Click(sender As Object, e As EventArgs) Handles Label2.Click
 
     End Sub
 
     Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
-        TextBox1.Text = ""
-        Label2.Text = ""
+        TextBox1.Text = TextBox1.Text.Remove(TextBox1.Text.Length - 1)
     End Sub
 
-    Private Sub Label3_Click(sender As Object, e As EventArgs) Handles Label3.Click
-
-    End Sub
-
-    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
+    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles num1.Click
         TextBox1.Text = TextBox1.Text + "1"
     End Sub
 
-    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
+    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles num2.Click
         TextBox1.Text = TextBox1.Text + "2"
     End Sub
 
-    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
+    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles num3.Click
         TextBox1.Text = TextBox1.Text + "3"
     End Sub
 
-    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click
+    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles num4.Click
         TextBox1.Text = TextBox1.Text + "4"
     End Sub
 
-    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.Click
+    Private Sub Button10_Click(sender As Object, e As EventArgs) Handles num5.Click
         TextBox1.Text = TextBox1.Text + "5"
     End Sub
 
-    Private Sub Button10_Click(sender As Object, e As EventArgs) Handles Button10.Click
+    Private Sub Button11_Click(sender As Object, e As EventArgs) Handles num6.Click
         TextBox1.Text = TextBox1.Text + "6"
     End Sub
 
-    Private Sub Button11_Click(sender As Object, e As EventArgs) Handles Button11.Click
+    Private Sub Button17_Click(sender As Object, e As EventArgs) Handles num7.Click
         TextBox1.Text = TextBox1.Text + "7"
     End Sub
 
-    Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click
+    Private Sub Button18_Click(sender As Object, e As EventArgs) Handles num8.Click
         TextBox1.Text = TextBox1.Text + "8"
     End Sub
 
-    Private Sub Button13_Click(sender As Object, e As EventArgs) Handles Button13.Click
+    Private Sub Button19_Click(sender As Object, e As EventArgs) Handles num9.Click
         TextBox1.Text = TextBox1.Text + "9"
     End Sub
 
-    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
-        TextBox1.Text = ""
-        Label2.Text = ""
-        Label1.Text = ""
+    Private Sub Button14_Click(sender As Object, e As EventArgs) Handles num0.Click
+        TextBox1.Text = TextBox1.Text + "0"
     End Sub
 
-    Private Sub Button24_Click(sender As Object, e As EventArgs) Handles Button24.Click
-        If Label2.Text = "+" Then
-            TextBox1.Text = Val(Label1.Text) + Val(TextBox1.Text)
-            Label1.Text = ""
-            Label2.Text = "+"
+    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Delenie.Click
+        TextBox1.Text = TextBox1.Text + "/"
+    End Sub
+
+    Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Multiply.Click
+        TextBox1.Text = TextBox1.Text + "*"
+    End Sub
+
+    Private Sub Button20_Click(sender As Object, e As EventArgs) Handles Minus.Click
+        TextBox1.Text = TextBox1.Text + "-"
+    End Sub
+
+    Private Sub Button16_Click(sender As Object, e As EventArgs) Handles Plus.Click
+        TextBox1.Text = TextBox1.Text + "+"
+    End Sub
+
+    Private Sub Button24_Click(sender As Object, e As EventArgs) Handles Ravno.Click
+        Dim text As String = TextBox1.Text
+        If text.Contains("+") Then
+            Dim parts() As String = text.Split("+")
+            TextBox2.Text = (Val(parts(0))) + Val(parts(1)).ToString()
+        ElseIf text.Contains("-") Then
+            Dim parts() As String = text.Split("-")
+            TextBox2.Text = (Val(parts(0))) - Val(parts(1)).ToString()
+        ElseIf text.Contains("/") Then
+            Dim parts() As String = text.Split("/")
+            If Val(parts(1)) <> 0 Then
+                TextBox2.Text = (Val(parts(0))) / Val(parts(1)).ToString()
+            Else
+                TextBox2.Text = "Делить на ноль нельзя!"
+            End If
+        ElseIf text.Contains("*") Then
+            Dim parts() As String = text.Split("*")
+            TextBox2.Text = (Val(parts(0))) * Val(parts(1)).ToString()
+        End If
+    End Sub
+
+    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
+        TextBox1.Clear()
+        TextBox2.Clear()
+    End Sub
+
+    Private Sub Button15_Click(sender As Object, e As EventArgs) Handles Button15.Click
+        If TextBox1.Text <> "" Then
+            Dim number As Integer = CInt(TextBox1.Text)
+            Dim remainder As Integer = number Mod 2
+            TextBox2.Text = remainder.ToString()
+        End If
+    End Sub
+
+    Private Sub Button13_Click(sender As Object, e As EventArgs) Handles Button13.Click
+        Dim s As String = TextBox1.Text
+        If s = "" Or s = "-" Then
+            TextBox1.Text = "-"
+        ElseIf s.StartsWith("-") Then
+            TextBox1.Text = s.Substring(1)
+        Else
+            TextBox1.Text = "-" & s
+        End If
+    End Sub
+
+    Private Sub Button21_Click(sender As Object, e As EventArgs) Handles Button21.Click
+        If memory <> 0 Then
+            TextBox1.Text = memory.ToString()
+        Else
+            TextBox1.Text = ("Память пуста!")
+        End If
+    End Sub
+
+    Private Sub Button22_Click(sender As Object, e As EventArgs) Handles Button22.Click
+        Try
+            Dim value As Double
+            If TextBox2.Text <> "" AndAlso TextBox2.Text <> "0" Then
+                value = Val(TextBox2.Text)
+            Else
+                TextBox1.Text = ("Нет значения для добавления в память")
+                Return
+            End If
+            memory += value
+        Catch ex As Exception
+            MessageBox.Show("Ошибка")
+        End Try
+    End Sub
+
+    Private Sub Button23_Click(sender As Object, e As EventArgs) Handles Button23.Click
+        If memory <> 0 Then
+            TextBox1.Text = ("Память очищена")
+            memory = 0
+        Else
+            TextBox1.Text = ("Память уже пуста!")
         End If
     End Sub
 End Class