using System;

class Program
{
    const int speed = 100;
    const int departTime = 10;
    static void Main(string[] args)
    {
        var dist = double.Parse(Console.ReadLine());
        string[] elapsed = (dist / speed).ToString().Split('.');
        int hour = departTime + int.Parse(elapsed[0]);
        int min;
        if (elapsed.Length <= 1) min = 0;
        else min = (int.Parse(elapsed[1]) * 60) / 10;
        Console.WriteLine("{0}:{1:D2}", hour, min);
    }
}