def _INFINITY_UNIQUE_NUMBER_SERIES(x, *args):
    if (len(args) == 0): return x - 1
    return _INFINITY_UNIQUE_NUMBER_SERIES((x * 2 - 1) * (2 ** args[0]), *args[1:])
def INFINITY_UNIQUE_NUMBER_SERIES(x, *args):
    return _INFINITY_UNIQUE_NUMBER_SERIES(x + 1, *args)