Function main

Hackerrank_problems/Day_Of_The_Programmer/solution2.cpp:13–29

*/

int main() {
    int year;
    cin >> year;
    if (year == 1918) { // transition
        cout << "26.09.1918\n";
    }
    else { // gregorian and/or julian
        if ((year < 1918 && year % 4 == 0) || (year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            cout << "12.09." << year << '\n';
        }
        else {
            cout << "13.09." << year << '\n';
        }
    }

    return 0;
}