#include <iostream>

int main(void){
	int a;
	std::cin >> a;
	std::cout << 10 + (a * 6 / 10) / 60 << ":";
	if ((a * 6 / 10) % 60 < 10)std::cout << "0";
	std::cout<<	(a * 6 / 10) % 60 << std::endl;
	return 0;
}