#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
	cout << "Please type a year: ";
	int year {0};
	cin >> year;

	if (!cin) {
		cerr << "Sorry, that wasn't a number.\n";
		return EXIT_FAILURE;
	}

        if (year % 400 == 0) {                             //year is a multiple of 400, e.g. 1600 or 2000
                cout << year << " is a leap year.\n";
        } else if (year % 100 == 0) {                      //year is a multiple of 100, e.g. 1800 or 1900
                cout << year << " is not a leap year.\n";
        } else if (year % 4 == 0) {                        //year is a multiple of 4, e.g. 2020 or 2024
                cout << year << " is a leap year.\n";
        } else {                                           //none of the above
                cout << year << " is not a leap year.\n";
        }

	return EXIT_SUCCESS;
}