diff --git a/1-module/1-task/index.js b/1-module/1-task/index.js
index 977f6f3..68a5eae 100644
--- a/1-module/1-task/index.js
+++ b/1-module/1-task/index.js
@@ -1,3 +1,6 @@
 function factorial(n) {
-  // ваш код...
+  if (n === 0 || n === 1) {
+    return 1;
+  } 
+  return n * factorial(n - 1); 
 }