diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..096746c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/node_modules/
\ No newline at end of file
diff --git a/main.py b/main.py
index 85b515f..04441a4 100644
--- a/main.py
+++ b/main.py
@@ -1,8 +1,8 @@
 def add(a: int, b: int) -> int:
-    return a - b
+    return a + b
 
 def multiply(a: int, b: int) -> int:
-    pass
+    return a * b
 
 if __name__ == "__main__":
     print("Please input the calculation you want: ")