def get_big_joker_value(deck):
    """ (list of int) -> int

    Gets the value of the big joker, which is the highest value in the deck.

    >>> get_big_joker_value([1, 3, 2, 5, 4])
    5
    >>> get_big_joker_value([1, 3, 2, 5, 4, 8, 6, 7])
    8
    """

    return max(deck)