ExamSchedule

using System;
using System.Globalization;
using System.Threading;

class ExamSchedule
{
    static void Main()
    {
        CultureInfo cultureEnUS = new CultureInfo("en-US");
        Thread.CurrentThread.CurrentCulture = cultureEnUS;
        string hour = Console.ReadLine();
        string minutes = Console.ReadLine();
        string partOfDay = Console.ReadLine();
        string durationHours = Console.ReadLine();
        string durationMinutes = Console.ReadLine();

        string startString = hour + ":" + minutes + partOfDay;
        DateTime examStart = DateTime.Parse(startString);
        string durationString = durationHours + ":" + durationMinutes;
        TimeSpan examDuration = TimeSpan.Parse(durationString);
        DateTime examEnd = examStart.Add(examDuration);
        Console.WriteLine("{0:hh:mm:tt}", examEnd);
    }
}