#include <stdio.h>
#include <stdlib.h>

int main()
{
      int sundays_counter=0,days_counter=2,day,month,year=1901;

      for(;year<=2000;year++)
            for(month=1;month<=12;month++)
            {
                  if(days_counter%7==0)
                        sundays_counter++;
                  switch(month)
                  {
                        case  1:
                        case  3:
                        case  5:
                        case  7:
                        case  8:
                        case 10:
                        case 12:
                        {
                                    for(day=1;day<=31;day++)
                                          days_counter++;
                        }break;
                        case  4:
                        case  6:
                        case  9:
                        case 11:
                        {
                                    for(day=1;day<=30;day++)
                                          days_counter++;
                        }break;
                        case  2:
                        {
                                    if(year%4)
                                          for(day=1;day<=28;day++)
                                                days_counter++;
                                    else
                                          for(day=1;day<=29;day++)
                                                days_counter++;
                        }
                  }
            }
      printf("\n\t%i\n\n",sundays_counter);
      return 0;
}