diff --git a/app.js b/app.js
index ad9a93a7..9d133241 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,19 @@
 'use strict';
+const memo =new Map();
+memo.set(0,0);
+memo.set(1,0);
+memo.set(2,1);
+
+function fib(n){
+    if(memo.has(n)){
+        return memo.get(n);
+    }
+    const value =fib(n-1) + fib(n-2) +fib(n-3);
+    memo.set(n,value);
+    return value;
+}
+    
+const lenght =40;
+for(let i=0; i<=lenght; i++){
+    console.log(fib(i));
+}