OnTimeForTheExam

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

namespace @byte
{
    class Program
    {
        static void Main(string[] args)
        {
            //•   Първият ред съдържа час на изпита – цяло число от 0 до 23.
            //•   Вторият ред съдържа минута на изпита – цяло число от 0 до 59.
            //•   Третият ред съдържа час на пристигане – цяло число от 0 до 23.
            //•   Четвъртият ред съдържа минута на пристигане – цяло число от 0 до 59.

            int hourOfExam = int.Parse(Console.ReadLine());
            int minuteOfExam = int.Parse(Console.ReadLine());
            int hourOfArrival = int.Parse(Console.ReadLine());
            int minuteOfArrival = int.Parse(Console.ReadLine());

            int examTotalMinutes = hourOfExam * 60 + minuteOfExam;
            int arrivalTotalMinutes = hourOfArrival * 60 + minuteOfArrival;

            int totalMinuteDifference = arrivalTotalMinutes - examTotalMinutes;

            int absTotalMinuteDiff = Math.Abs(totalMinuteDifference);
            int hour = absTotalMinuteDiff / 60;
            int minute = absTotalMinuteDiff % 60;


            string result = "";
            if (examTotalMinutes == arrivalTotalMinutes)
            {
                result = "On time";
            }
            else if (totalMinuteDifference >= -30 && totalMinuteDifference <= -1)
            {
                result = $"On time{Environment.NewLine}{absTotalMinuteDiff} minutes before the start";
            }
            else if (totalMinuteDifference >= -59 && totalMinuteDifference <= -31)
            {
                result = $"Early{Environment.NewLine}{absTotalMinuteDiff} minutes before the start";
            }
            else if (totalMinuteDifference <= -60)
            {
                result = $"Early{Environment.NewLine}{hour}:{minute:d2} hours before the start";
            }
            else if (totalMinuteDifference >= 1 && totalMinuteDifference <= 59)
            {
                result = $"Late{Environment.NewLine}{absTotalMinuteDiff} minutes after the start";
            }
            else if (totalMinuteDifference >= 60)
            {
                result = $"Late{Environment.NewLine}{hour}:{minute:d2} hours after the start";
            }

            Console.WriteLine(result);
        }
    }
}