diff --git a/app.js b/app.js
index ad9a93a7..f0973cba 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,17 @@
 'use strict';
+const memo = new Map();
+memo.set(0,0);
+memo.set(1,1);
+function fib(n) {
+    if(memo.has(n)){
+        return memo.get(n);
+    }
+    const value=fib(n-1)+fib(n-2);
+    memo.set(n,value);
+    return value;
+}
+
+const length = 40;
+for (let i=0;i<=length;i++){
+    console.log(fib(i));
+}
\ No newline at end of file