C# Fundamentals - Time + 30 minutes

using System;
namespace ConsoleApp8
{
    class Program
    {
        static void Main(string[] args)
        {
            var hour = int.Parse(Console.ReadLine());
            var minutes = int.Parse(Console.ReadLine());

            minutes += 30;

            hour += minutes / 60;
            minutes = minutes % 60;

            if (hour >= 24)
            {
                hour = 0;
            }
            Console.WriteLine("{0:D2}:{1:D2}", hour, minutes);
         }
    }
}