(denomination, number_of_bills)
:param denomination: int - the value of a bill.
    :param number_of_bills: int - amount of bills you received.
    :return: int - total value of bills you now have.
def get_value_of_bills(denomination, number_of_bills):
    """

    :param denomination: int - the value of a bill.
    :param number_of_bills: int - amount of bills you received.
    :return: int - total value of bills you now have.
    """

    pass
def get_value_of_bills ( denomination , number_of_bills ) : pass