OnTimeForTheExam

using System;

namespace OnTimeForTheExam
{
    class OnTimeForTheExam
    {
        static void Main(string[] args)
        {
            int hExam = int.Parse(Console.ReadLine());
            int mExam = int.Parse(Console.ReadLine());
            int hArrive = int.Parse(Console.ReadLine());
            int mArrive = int.Parse(Console.ReadLine());

            var minExam = hExam*60+mExam;
            var minArrive = hArrive*60+mArrive;
            var onTime = minExam - minArrive;
            var late = minArrive - minExam;


            if (onTime == 0) Console.WriteLine("On time");
            else if (onTime > 0 && onTime <= 30)
            {
                Console.WriteLine("On time");
                Console.WriteLine("{0} minutes before the start", onTime);
            }
            else if (onTime > 30 && onTime < 60)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0} minutes before the start", onTime);
            }
            else if (onTime >= 60)
            {
                Console.WriteLine("Early");
                Console.WriteLine("{0}:{1:00} hours before the start", (int)onTime / 60, onTime % 60);
            }
            else if (late>0 && late < 60)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0} minutes after the start", late);
            }
            else if (late >= 60)
            {
                Console.WriteLine("Late");
                Console.WriteLine("{0}:{1:00} hours after the start", (int)late / 60, late % 60);
            }



        }
    }
}