diff --git a/Exercises/1-seq.js b/Exercises/1-seq.js
index bdf0fe8..24de101 100644
--- a/Exercises/1-seq.js
+++ b/Exercises/1-seq.js
@@ -1,5 +1,5 @@
 'use strict';
 
-const seq = f => g => x => 0;
+const seq = f => g => x => (typeof x === 'number' ? f(g(x)) : seq(i => f(g(i)))(x));
 
 module.exports = { seq };