On Time For The Exam

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

namespace _07OnTimeForTheExam
{
    class Program
    {
        static void Main(string[] args)
        {
            int examH = int.Parse(Console.ReadLine());
            int examM = int.Parse(Console.ReadLine());
            int arrH = int.Parse(Console.ReadLine());
            int arrM = int.Parse(Console.ReadLine());

            int examTimeInMin = (examH * 60) + examM;
            int arrTimeInMin = (arrH * 60) + arrM;

            if (examTimeInMin < arrTimeInMin)
            {
                Console.WriteLine("Late");

                int diff = arrTimeInMin - examTimeInMin;

                if (diff<60)
                {
                    Console.WriteLine("{0} minutes after the start",diff);
                }

                else

                {
                    int diffMin = diff % 60;
                    int diffHrs = diff / 60;

                    Console.WriteLine("{0}:{1:D2} hours after the start",diffHrs,diffMin);
                }
            }
            else if (examTimeInMin == arrTimeInMin)
            {
                Console.WriteLine("On time");
            }
            else if (examTimeInMin - arrTimeInMin <=30)
            {
                Console.WriteLine("On time");

                int diff = examTimeInMin - arrTimeInMin;
                Console.WriteLine("{0} minutes before the start",diff);
            }
            else if (examTimeInMin - arrTimeInMin >30)
            {
                Console.WriteLine("Early");

                int diff = examTimeInMin - arrTimeInMin;

                if (diff<60)
                {
                    Console.WriteLine("{0} minutes before the start", diff);
                }
                else

                {
                    int diffMin = diff % 60;
                    int diffHrs = diff / 60;

                    Console.WriteLine("{0}:{1:D2} hours before the start", diffHrs, diffMin);
                }
            }
        }
    }
}