03. On Time for the Exam

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication11
{
    class Program
    {
        static void Main(string[] args)
        {
            int examHour = int.Parse(Console.ReadLine());
            int examMinute = int.Parse(Console.ReadLine());
            int arrivingHour = int.Parse(Console.ReadLine());
            int arrivingMinute = int.Parse(Console.ReadLine());
            int diff = ((examHour * 60) + examMinute) - ((arrivingHour * 60) + arrivingMinute);
            int hour = diff / 60;
            int minute = diff % 60;

            if (diff == 0)
            {
                Console.WriteLine("On Time");
            }
            else if (diff >= 1 && diff <= 30)
            {
                Console.WriteLine("On Time");
                Console.WriteLine("{0} minutes before the start", diff);
            }
            else if (diff > 30 && diff <= 59)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0} minutes before the start", diff);
            }
            else if (diff == 60)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0}:00 hours before the start", hour);
            }
            else if (diff > 60 && diff <= 69)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0}:0{1} hours before the start", hour, minute);
            }
            else if (diff >= 70)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0}:{1} hours before the start", hour, minute);
            }
            else if (diff < 0 && diff >= -59)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0} minutes after the start", Math.Abs(diff));
            }
            else if (diff == -60)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0}:00 hours after the start", Math.Abs(hour));
            }
            else if (diff < -60 && diff >= -69)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0}:0{1} hours after the start", Math.Abs(hour), Math.Abs(minute));
            }
            else if (diff <= -70)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0}:{1} hours after the start", Math.Abs(hour), Math.Abs(minute));
            }

        }
    }
}