diff --git a/app.js b/app.js
index ad9a93a..952cb9a 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,15 @@
 '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 lenght = 40;
+for(let i=0; i <= lenght; i++){
+  console.log(`${i}番目は${fib(i)}`);
+}
\ No newline at end of file