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

namespace u2
{
    class Program
    {
        static void Main(string[] args)
        {

            int startTimeMin = 61, endTimeMin = 180; // laikotarpio pradžia 01:01, pabaiga 03:00
            int nightTimeStartMin = 60, nightTimeEndMin = 300; // naktinio pradžia 01:00, pabaiga 05:00
            int para = 3; // parų skaičius
            int result = 0;

            if (para == 0)
            {
                if (startTimeMin <= nightTimeStartMin && endTimeMin >= nightTimeEndMin)
                    result = nightTimeEndMin - nightTimeStartMin;
                if (startTimeMin <= nightTimeStartMin && endTimeMin <= nightTimeEndMin)
                    result = endTimeMin - nightTimeStartMin;

                if (startTimeMin >= nightTimeStartMin && endTimeMin >= nightTimeEndMin)
                    result = nightTimeEndMin - startTimeMin;

                if (startTimeMin >= nightTimeStartMin && endTimeMin <= nightTimeEndMin)
                    result = endTimeMin - startTimeMin;

                if (result < 0) result = 0;
            }
            else
            {
                int test1 = nightTimeEndMin - endTimeMin;
                int test2 = nightTimeEndMin - startTimeMin;
                if (test1 < 0 && test2 < 0) result = (nightTimeEndMin - nightTimeStartMin) + (nightTimeEndMin - nightTimeStartMin) * (para - 1);
                if (test2 > 0 && test1 > 0) result = (nightTimeEndMin - startTimeMin) + (endTimeMin - nightTimeStartMin) + (nightTimeEndMin - nightTimeStartMin) * (para - 1);
                if (test2 < 0 && test1 > 0) result = (endTimeMin - nightTimeStartMin) + (nightTimeEndMin - nightTimeStartMin) * (para - 1);
                if (test1 < 0 && test2 > 0) result = (nightTimeEndMin - nightTimeStartMin) + (nightTimeEndMin - startTimeMin) + (nightTimeEndMin - nightTimeStartMin) * (para - 1);
            }

            Console.Write(result);
            Console.Read();
        }
    }
}