diff --git a/calculator.py b/calculator.py
index 90f5426..4dae1f3 100644
--- a/calculator.py
+++ b/calculator.py
@@ -1,9 +1,9 @@
 def add(a, b):
-    pass
+    return a + b
 
 
 def subtract(a, b):
-	pass
+	return a - b
 
 
 def multiply(a, b):
@@ -27,5 +27,5 @@ def mod(a, b):
 
 
 if __name__ == "__main__":
-    # 간단한 테스트 코드
-    pass
\ No newline at end of file
+    print(add(3,2))
+    print(subtract(3,2))
\ No newline at end of file