diff --git a/sum/sum.go b/sum/sum.go
index 1da0e52..cdb6299 100644
--- a/sum/sum.go
+++ b/sum/sum.go
@@ -3,5 +3,5 @@
 package sum
 
 func Sum(a, b int64) int64 {
-	return 0
+	return a + b 
 }