Навреме за изпит : On Time for the Exam

using System;

namespace dwdwdwdwDD
{
    class Program
    {
        static void Main(string[] args)
        {

            var hourOfExam = int.Parse(Console.ReadLine());
            var minOfExam = int.Parse(Console.ReadLine());

            var hourOfAraiv = int.Parse(Console.ReadLine());
            var minOfAraiv = int.Parse(Console.ReadLine());

            var totalMinOfExam = (hourOfExam * 60) + minOfExam;
            var totalMinOfAraiv = (hourOfAraiv * 60) + minOfAraiv;

            var difference = totalMinOfExam - totalMinOfAraiv;
            Console.WriteLine(difference + " difference");


            var lastDifference = Math.Abs(difference);
            Console.WriteLine(lastDifference+ " lastDifference");


            var hours = lastDifference / 60;
            var minutes = lastDifference % 60;


            if (difference < 0)
            {
                Console.WriteLine("Late");

                if (hours == 0)
                {
                    Console.WriteLine($"{minutes} minutes after the start");
                }
                else if (hours > 0)
                {
                    Console.WriteLine($"{hours}:{minutes:d2} hours after the start");
                }
            }

            else if (difference == 0 || difference <= 30)
            {
                Console.WriteLine("On time");
                if (hours == 0 && minutes == 0)
                {
                    Console.WriteLine();
                }
                else if (hours == 0)
                {
                    Console.WriteLine($"{minutes} minutes before the start");
                }
                else if (hours > 0)
                {
                    Console.WriteLine($"{hours}:{minutes:d2} hours before the start");
                }
            }
            else if (difference > 30)
            {
                Console.WriteLine("Early");

                if (hours == 0)
                {
                    Console.WriteLine($"{minutes} minutes before the start");
                }
                else if (hours > 0)
                {
                    Console.WriteLine($"{hours}:{minutes:d2} hours before the start");
                }
            }
        }
    }
}