Day of the week

#include <iostream>
using namespace std;

int dayOfTheWeek(int day, int month, int year)
{
    year -= (14 - month) / 12;
    month = month + 12 * ((14 - month) / 12) - 2;
    day = (day + year + year / 4 - year / 100 + year / 400 + (31 * month / 12)) % 7;
    if(day == 0) return 7;
    return day;
}
int main()
{
    int day, month, year;
    cin >> day >> month >> year;
    cout << dayOfTheWeek(day, month, year);
    return 0;
}