#include <iostream> using namespace std; int main() { int a; cin >> a; if (a / 3600 < 10) { cout << "0" << a / 3600 << ":"; } else { cout << a / 3600 << ":"; } if (a % 3600 / 60 < 10) { cout << "0" << a % 3600 / 60 << ":"; } else { cout << a % 3600 / 60 << ":"; }if (a % 3600 % 60 < 10) { cout << "0" << a % 3600 % 60 << ":"; } else { cout << a % 3600 % 60; } return 0; }