diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -42,7 +42,7 @@
 
 
 suki = 10**9 + 5
-kirai = -1
+kirai = 0
 while suki - kirai > 1:
     targ = (suki + kirai) // 2
     if canreach(targ):
