diff --git a/2.py b/2.py
new file mode 100644
index 0000000..c571323
--- /dev/null
+++ b/2.py
@@ -0,0 +1,4 @@
+a=8
+b=4
+c=a+b
+print c
diff --git a/add.py b/add.py
index c571323..ee4b6d4 100644
--- a/add.py
+++ b/add.py
@@ -1,4 +1,5 @@
 a=8
 b=4
 c=a+b
+c=a-b
 print c
diff --git a/calculator b/calculator
index 80a04da..643009c 100644
--- a/calculator
+++ b/calculator
@@ -28,4 +28,5 @@ int main() {
   }
 
   return 0;
+end switch
 }