diff --git a/src/__pycache__/calculator.cpython-315.pyc b/src/__pycache__/calculator.cpython-315.pyc
new file mode 100644
index 0000000..188bff0
Binary files /dev/null and b/src/__pycache__/calculator.cpython-315.pyc differ
diff --git a/src/calculator.py b/src/calculator.py
index e41739a..983e401 100644
--- a/src/calculator.py
+++ b/src/calculator.py
@@ -6,3 +6,13 @@ def add(left: int, right: int) -> int:
 
 def subtract(left: int, right: int) -> int:
     return left - right
+
+
+def multiply(left: int, right: int) -> int:
+    return left * right
+
+
+def divide(left: int, right: int) -> int:
+    if right == 0:
+        raise ValueError('division by zero')
+    return left // right