using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int nT = int.Parse(Console.ReadLine()) * 60 / 100 + 10 * 60;
            int nH = nT / 60;
            int nM = nT % 60;
            Console.WriteLine(nH.ToString("D02") + ":" + nM.ToString("D02"));
            //Console.ReadLine();
        }
    }
}