def multiply(**kwargs):
    """Simple postprocessor where we multiply the input values.

    :param kwargs: Dictionary of values to multiply
    :type kwargs: dict

    :return: The result.
    :rtype: float
    """
    result = 1
    for i in list(kwargs.values()):
        if not i:
            # If one value is null, we return null.
            return i
        result *= i
    return result