pe19

#include <stdio.h>

int months[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

int main()
{
  int count=0, d=0, m;

  for (m=0; m<12*100; m++)
  {
    d += months[m%12];
    if (m%12 == 1 && (m/12)%400 == 0 && (m/12)%100 != 0 && (m/12)%4 == 0) d++;
    if (d%7 == 0) count++;
  }

  printf("%d\n",count);
  return 0;
}