03. Back in 30 Minutes

Every time Stamat tries to pay his bills he sees on the cash desk the sign: "I will be back in 30 minutes". One day Stamat was sick of waiting and decided he needs a program, which prints the time after 30 minutes. That way he won’t have to wait on the desk and come at the appropriate time. He gave the assignment to you, so you have to do it.
using System;

namespace _03._Back_in_30_Minutes
{
    class BackIn30Mins
    {
        static void Main(string[] args)
        {
            int hours = int.Parse(Console.ReadLine());
            int mins = int.Parse(Console.ReadLine());

            mins += 30;

            if (mins > 59)
            {
                hours++;
                mins -= 60;
            }
            if (hours > 23)
            {
                hours = 0;
            }
            Console.WriteLine("{0}:{1:d2}", hours, mins);
        }
    }
}