diff --git a/03-1/1/1.c b/03-1/1/1.c
index d3b1cc1..918e380 100644
--- a/03-1/1/1.c
+++ b/03-1/1/1.c
@@ -3,9 +3,9 @@
 int month2day(int year,int month){
 	int tmp[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
 	
-	if (year % 4 == 0)tmp[1]++;
+	if(((year%4==0) && (year%100!=0)) || year%400==0)tmp[1]++;
 	
-	return tmp[month-1];
+	return tmp[month-2];
 }
 
 int main(){