diff --git a/day15/part1.js b/day15/part1.js
index 1d1967d..f560e12 100644
--- a/day15/part1.js
+++ b/day15/part1.js
@@ -4,7 +4,8 @@ var total = 0;
 for(var i = 0; i <= 40000000; i++){
 	a = (a*16807)%2147483647;
 	b = (b*48271)%2147483647;
-	if(a.toString(2).slice(-16) == b.toString(2).slice(-16)){
+	padding = "0000000000000000";
+	if((padding+a.toString(2)).slice(-16) == (padding+ b.toString(2)).slice(-16)){
 		total++;
 		console.log(i);
 		console.log(a, b);