import struct


def decode_ga(ga: int) -> str:
    """ Decodes a group address into human readable string representation

    >>> decode_ga(270)
    '0/1/14'
    """
    if not isinstance(ga, int):
        ga = struct.unpack('>H', ga)[0]
    return '{}/{}/{}'.format((ga >> 11) & 0x1f, (ga >> 8) & 0x07, (ga) & 0xff)