#include <ctime>
#include <iostream>
 
using namespace std;
 
bool leap_year(int year) {
	tm bar = { 0, 0, 0, 29, 1, year - 1900 };
 
	return time_t(-1) != mktime(&bar) && bar.tm_mday == 29 && bar.tm_mon == 1 && bar.tm_year == year - 1900;
}
 
int main() {
	cout << "2000: " << leap_year(2000) << "\n2001: " << leap_year(2001) << "\n2004: " << leap_year(2004) << "\n1900: " << leap_year(1900) << "\n2100: " << leap_year(2100) << endl;
	return 0;
}

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