Izpit

using System;

namespace On_Time_for_the_Exam
{
    class Program
    {
        static void Main ( string[] args )
        {
            int Chas_Start = int.Parse(Console.ReadLine());
            int Min_Start = int.Parse(Console.ReadLine());
            int Chas_doshal = int.Parse(Console.ReadLine());
            int Min_doshal = int.Parse(Console.ReadLine());

            TimeSpan Vreme_Start = new TimeSpan(Chas_Start, Min_Start, 0);
            TimeSpan Vreme_Doshal = new TimeSpan(Chas_doshal, Min_doshal, 0);
            TimeSpan TS_Result = Vreme_Start - Vreme_Doshal;

            string result = "";
            if ((TS_Result.Hours == 0 && TS_Result.Minutes >= -30 && TS_Result.Minutes<=30 && TS_Result.Minutes>=0))
            {
                result = "On time";
            }
            else if (Vreme_Doshal < Vreme_Start.Add(new TimeSpan(0, -30, 0)))
            {
                result = "Early";
            }
            else
            {
                result = "Late";
            }
            if (TS_Result.Hours == 0)
            {
                if (TS_Result.Ticks > 0)
                {
                    Console.WriteLine("{0}\n{1} minutes before the start", result, Math.Abs(TS_Result.Minutes));
                }
                else
                {
                    Console.WriteLine("{0}\n{1} minutes after the start", result, Math.Abs(TS_Result.Minutes));
                }
            }
            else
            {
                if (TS_Result.Ticks > 0)
                {
                    Console.WriteLine("{0}\n{1}:{2:00} hours before the start", result, Math.Abs(TS_Result.Hours), Math.Abs(TS_Result.Minutes));
                }
                else
                {
                    Console.WriteLine("{0}\n{1}:{2:00} hours after the start", result, Math.Abs(TS_Result.Hours), Math.Abs(TS_Result.Minutes));
                }
            }
        }
    }
}