#include <conio.h>;
#include <iostream>;
#include <climits>;

using std::cout;
using std::cin;
using std::endl;

int main()
{
         const int minimal_year = 1583;
         int year;
         setlocale(LC_ALL, "Russian");

         cout<<"Введите год (после 1582)"<<endl;
         cin>>year;
         if(year>=minimal_year )
         {
          int a, y, m, dd, d=13, friday = 6, result=0;
          for(int month(1); month < 13;month++)
          {
           a = (14 - month)/12;
           y = year - a;
           m = month + 12*a - 2;
           dd = (7000 + (d + y + (int)(y / 4) - int(y / 100) + int(y / 400) + int((31 * m) / 12))) % 7;
           if(dd==friday)
           {
            result++;
           }
          }
          cout <<"пятниц 13 - "<<result<<" шт.";
         }
         else
         {
          cout << "Глупый что ли?"<<endl;
         }
         _getch();
         return 0;
}