diff --git a/04week/loop.js b/04week/loop.js
index e69de29bb..7de4cbd54 100644
--- a/04week/loop.js
+++ b/04week/loop.js
@@ -0,0 +1,9 @@
+var result = "";
+var i = 0;
+
+do {
+  i = i + 1;
+  result = result + i;
+} while (i < 1000);
+
+console.log(result);
\ No newline at end of file