//C++
#include <iostream>
using namespace std;
int main(){
int n;
cin >> n;
cout << n / 3600 << ":" << n % 3600 / 60 << ":" << n % 60<< endl;
return 0;
}
//java
import java.util.Scanner;
public class Main{
public static void main(String... args) {
Scanner s = new Scanner(System.in);
int n = s.nextInt();
System.out.println(n / 3600 + ":" + n % 3600 / 60 + ":" + n % 60);
}
}