class Program
{
    static void Main(string[] args)
    {
        int count = int.Parse(Console.ReadLine()!);
        int hour = 0;
        int minute = 0;

        for (int i = 0; i < count; i++)
        {
            string[] input = Console.ReadLine()!.Split(' ');
            TimeSpan start = TimeSpan.Parse(input[0]);
            TimeSpan wakeup = TimeSpan.Parse(input[1]);

            int startHour = start.Hours;
            int wakeupHour = wakeup.Hours;
            int startMinute = start.Minutes;
            int wakeupMinute = wakeup.Minutes;

            if (startHour == wakeupHour)
            {
                if (startMinute < wakeupMinute)
                {
                    minute += wakeupMinute - startMinute;
                }
                else
                {
                    hour += 23;
                    minute += 60 - (startMinute - wakeupMinute);
                }
            }
            else if (startMinute != wakeupMinute)
            {
                minute += 60 - startMinute + wakeupMinute;
            }
            
            if (wakeupHour < startHour)
            {
                hour += 23 - startHour + wakeupHour; 
            }
            else
            {
                hour += wakeupHour - startHour;
            }
        }
        
        int a = minute / 60;
        int b = minute - a * 60;
        Console.WriteLine(a);
        Console.WriteLine(b);
        hour = (hour + a) * 60;
        Console.WriteLine(hour + b);
    }
}