diff --git a/dao/sum.js b/dao/sum.js
index 6fb269a24d5c9c73736fc194d45ada157efec44b..56b0fd850b1dcb1e85078ef5f2e81a6b29d01adf 100644
--- a/dao/sum.js
+++ b/dao/sum.js
@@ -1,4 +1,4 @@
 function sum(a, b) {
-  return a + b;
+  return a + b + 2;
 }
-module.exports = sum;
\ No newline at end of file
+module.exports = sum;