09. On Time for the Exam

using System;

namespace OnTimefortheExam
{
    class Program
    {
        static void Main(string[] args)
        {
            int hourExam = int.Parse(Console.ReadLine());
            int minutesExam = int.Parse(Console.ReadLine());
            int arrivalHour = int.Parse(Console.ReadLine());
            int arrivalMinutes = int.Parse(Console.ReadLine());

            int examTotalMinutes = (hourExam * 60) + minutesExam;    //630
            int arrivalTotalMinutes = (arrivalHour * 60) + arrivalMinutes;  //600

            if (examTotalMinutes >= arrivalTotalMinutes)
            {
                int diff = examTotalMinutes - arrivalTotalMinutes;
                if (diff==0)
                {
                    Console.WriteLine("On time");
                }

               else  if (diff <= 30)
                {

                    Console.WriteLine("On time");
                    Console.WriteLine("{0} minutes before the start", diff);
                }
                else if (diff > 30)
                {
                    Console.WriteLine("Early");
                    if (diff < 60)
                    {
                        Console.WriteLine("{0} minutes before the start", diff);
                    }
                    else if (diff >= 60)
                    {
                        int hours = diff / 60;
                        int min = diff % 60;
                        if (min > 9)
                        {
                            Console.WriteLine("{0}:{1} hours before the start", hours, min);
                        }
                        else if (min < 10)
                        {
                            Console.WriteLine("{0}:0{1} hours before the start", hours, min);
                        }
                    }

                }

            }
            else
            {
                Console.WriteLine("late");
                int diff = arrivalTotalMinutes - examTotalMinutes;
                if (diff < 60)
                {
                    Console.WriteLine("{0} minutes after the start", diff);
                }
                else if (diff >= 60)
                {
                    int hour = diff / 60;
                    int minutes = diff % 60;
                    if (minutes > 9)
                    {
                        Console.WriteLine("{0}:{1} hours after the start", hour, minutes);
                    }
                    else if (minutes < 10)
                    {
                        Console.WriteLine("{0}:0{1} hours after the start", hour, minutes);
                    }
                }
            }
        }
    }
}