timespan example

using System;


public class Program
{
    public static void Main()
    {

        int hours=int.Parse(Console.ReadLine());
        int minutes=int.Parse(Console.ReadLine());

        TimeSpan ts=new TimeSpan(hours,minutes,0);
        TimeSpan tsAdd=new TimeSpan(0,15,0);
        ts+=tsAdd;
        Console.WriteLine(ts.ToString(@"hh\:mm"));

    }
}