On Time for the Exam

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

namespace Ontime_for_Exam
{
    class ontime
    {
        static void Main(string[] args)
        {
            int examHours = int.Parse(Console.ReadLine());
            int examMinutes = int.Parse(Console.ReadLine());
            int ariveHours = int.Parse(Console.ReadLine());
            int ariveMinutes = int.Parse(Console.ReadLine());

            int toMinutes = ((examHours * 60) + examMinutes) - ((ariveHours * 60) + ariveMinutes);

            bool onTime = toMinutes == 0;
            bool inRange = toMinutes > 0 && toMinutes <= 30;
            bool late = toMinutes < 0;
            bool early = toMinutes > 30;

            if (onTime)
            {
                Console.WriteLine("On time");
            }
            else if (inRange)
            {
                if (toMinutes > 59)
                {
                    int hours = toMinutes / 60;
                    int minutes = toMinutes % 60;
                    Console.WriteLine($"On time\n{hours}:{minutes:00} hours before the start");
                }
                Console.WriteLine($"On time\n{toMinutes} minutes before the start");
            }
            else if (late)
            {
                toMinutes = Math.Abs(toMinutes);
                if (toMinutes > 59)
                {
                    int hours = toMinutes / 60;
                    int minutes = toMinutes % 60;
                    Console.WriteLine($"Late\n{hours}:{minutes:00} hours after the start");
                }
                else
                {
                    Console.WriteLine($"Late\n{toMinutes} minutes after the start");
                }
            }
            else if (early)
            {
                if (toMinutes > 59)
                {
                    int hours = toMinutes / 60;
                    int minutes = toMinutes % 60;
                    Console.WriteLine($"Early\n{hours}:{minutes:00} hours before the start");
                }
                else
                {
                    Console.WriteLine($"Early\n{toMinutes} minutes before the start");
                }
            }
        }
    }
}