diff --git a/index.js b/index.js
index de6dae1a..60611195 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,7 @@
-function isEven(x) {
+const add = require("./server");
+add(1,2)
+
+function isEven(x) {
   if ((x = 2 || x % 2 == 0)) {
     console.log(`${x} is even`);
   } else console.log(`${x} is odd`);
diff --git a/server.js b/server.js
index 2e00d0f7..f866c610 100644
--- a/server.js
+++ b/server.js
@@ -23,3 +23,12 @@ request('http://www.google.com', function (error, response, body) {
 app.get('/', function (req, res) {
   res.send('hello')
 });
+
+/**
+ * @deprecated
+ */
+function add(a, b) {
+  return a + b;
+}
+
+module.exports = add;