using System;

class Program
{
    public void Solve()
    {
        int a = int.Parse(Console.ReadLine());

        TimeSpan time = new TimeSpan(10, 0, 0);
        TimeSpan addTime = new TimeSpan(0, (a / 100 * 10 + a % 100 / 10) * 6, 0);
        time += addTime;

        Console.WriteLine(time.ToString(@"hh\:mm"));
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}