OnTimeForExam

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

namespace On_Time_For_The_Exam
{
    class Program
    {
        static void Main(string[] args)
        {
            int examHour = int.Parse(Console.ReadLine());
            int examMinute = int.Parse(Console.ReadLine());
            int arrivalHour = int.Parse(Console.ReadLine());
            int arrivalMinute = int.Parse(Console.ReadLine());

            var examTime = (examHour * 60) + examMinute;
            var arrivalTime = (arrivalHour * 60) + arrivalMinute;
            var difference = arrivalTime - examTime;

            if (difference > 0)
            {
                if (difference <= 59)
                {
                    Console.WriteLine("Late");
                    Console.WriteLine("{0} minutes after the start", difference);
                }
                else if (difference >= 60)
                {
                    Console.WriteLine("Late");
                    Console.WriteLine("{0}:{1:00} hours after the start", (arrivalTime - examTime) / 60, (arrivalTime - examTime) % 60);
                }
            }
            if (difference < 0)
            {
                if (Math.Abs(difference) <= 30)
                {
                    Console.WriteLine("On time");
                    Console.WriteLine("{0} minutes before the start", Math.Abs(difference));
                }
                else if (Math.Abs(difference) > 30 && Math.Abs(difference) <= 59)
                {
                    Console.WriteLine("Early");
                    Console.WriteLine("{0} minutes before the start", Math.Abs(difference));
                }
                else if (Math.Abs(difference) >= 60)
                {
                    Console.WriteLine("Early");
                    Console.WriteLine("{0}:{1:00} hours before the start", (examTime - arrivalTime) / 60, (examTime - arrivalTime) % 60);
                }
            }
            else if (difference == 0)
            {
                Console.WriteLine("On time");
            }
        }
    }
}