diff --git a/app/calculator.py b/app/calculator.py
index 4f380e8e..e2e7b97c 100644
--- a/app/calculator.py
+++ b/app/calculator.py
@@ -14,3 +14,5 @@ def divide(x, y):
             return 'Cannot divide by 0'
         return x * 1.0 / y
 
+    def mul_add(x, y):
+        return (x + y) * x