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num_of_round, day, hour, minute = map(int, input().split())

match num_of_round:
    case 1:
        end_day = 24
    case 2:
        end_day = 25
    case 3:
        end_day = 26
    case 4:
        end_day = 27
    case 5:
        end_day = 29
total_minutes = (end_day - day + 1) * 24 * 60 - (hour * 60 + minute)
if num_of_round == 5 and (day < 29 or (day == 29 and hour < 2)):
    total_minutes -= 60
print(total_minutes)