On Time for the Exam

using System;

public class Program
{

    static void Main(string[] args)
    {
        int examHour = int.Parse(Console.ReadLine());
        int examMinites= int.Parse(Console.ReadLine());
        int arrivalHour= int.Parse(Console.ReadLine());
        int arrivalMinites = int.Parse(Console.ReadLine());

        var examTime = new TimeSpan(examHour, examMinites, 0);
        var arrivalTime = new TimeSpan(arrivalHour, arrivalMinites, 0);

        if (arrivalTime > examTime)
        {
            var delay = (arrivalTime - examTime);
            Console.WriteLine("Late");
            Console.WriteLine((delay.Hours != 0)
                ? delay.ToString(@"h\:mm") + " hours after the start"
                : delay.Minutes + " minutes after the start");
        }
        else if (arrivalTime < examTime - new TimeSpan(0, 30, 0))
        {
            var timeToWait = (examTime - arrivalTime);
            Console.WriteLine("Early");
            Console.WriteLine((timeToWait.Hours != 0)
                ? timeToWait.ToString(@"h\:mm") + " hours before the start"
                : timeToWait.Minutes + " minutes before the start");
        }
        else
        {
            var timeToWait = (examTime - arrivalTime);
            Console.WriteLine("On time");
            Console.WriteLine(timeToWait.Minutes + " minutes before the start");
        }
    }
}