OnTimeForExam

using System;

namespace OnTimeForExam
{
    class Program
    {
        static void Main(string[] args)
        {
            int examHour = int.Parse(Console.ReadLine());
            int examMin = int.Parse(Console.ReadLine());
            int arriveHour = int.Parse(Console.ReadLine());
            int ariveMin = int.Parse(Console.ReadLine());

            int hourDiff = ((examHour * 60) + examMin) - ((arriveHour * 60) + ariveMin);
            string txt = " ";

            if(hourDiff < 0 )
            {
                txt = "Late";
            }
            else if( hourDiff >= 0 && hourDiff <= 30)
            {
                txt = "On time";
            }
            else
            {
                txt = "Early";
            }
            Console.WriteLine(txt);

            int hours = hourDiff / 60;
            hours *= 60;

            if( hourDiff > 0 && hourDiff < 60)
            {
                Console.WriteLine($"{hourDiff} minutes before the start");
            }
            else if( hourDiff >= 60 )
            {
                Console.WriteLine($"{hourDiff/60}:{hourDiff-hours} hours before the start");
            }
            else if (hourDiff < 0 && hourDiff > - 60)
            {
                Console.WriteLine($"{hourDiff*-1} minutes after the start");
            }
            else if (hourDiff <= -60)
            {
                Console.WriteLine($"{hourDiff / 60 * -1}:{(hourDiff - hours)*-1} hours after the start");
            }
        }
    }
}