HOURS_IN_DAY = 24
MINUTES_IN_HOUR = 60
MINUTES_IN_DAY = HOURS_IN_DAY*MINUTES_IN_HOUR


class Clock:
    def __init__(self, hour=0, minute=0):
        self.minutes = (MINUTES_IN_HOUR*hour + minute) % MINUTES_IN_DAY

    def __repr__(self):
        hours = self.minutes // MINUTES_IN_HOUR
        minutes = self.minutes % MINUTES_IN_HOUR
        return f'{hours:02}:{minutes:02}'

    def __eq__(self, other):
        return self.minutes == other.minutes

    def __add__(self, minutes):
        clock = Clock()
        clock.minutes = (self.minutes + minutes) % MINUTES_IN_DAY
        return clock

    def __sub__(self, minutes):
        return self.__add__(-minutes)