确定母亲节日期

#include <stdio.h>
int main()
{
 int a,b=5,c,year,day,leap,d,counter=0;
 scanf("%d",&a);
 year=a-1900;
 leap=year/4;
 for(c=8;c<=14;c++)
 {
 day=year*365+leap+30*(b-1)+c;
 d=day%7;
 if(0==d) {
           printf("%d\n",c);
           break;
          }
 }
   return 0;
}