using System;

public class Program

{

    public static void Main()

    {

        int H, M, S, A, input;

        input = int.Parse(Console.ReadLine());

        A = 3600;

        H = input / A;

        M = (input - (A * H)) / 60;

        S = (input - (A * H) - (M * 60));

        Console.WriteLine($"{H}:{M}:{S}");

    }

}