def dictadd(*dicts):
    """
    Returns a dictionary consisting of the keys in the argument dictionaries.
    If they share a key, the value from the last argument is used.
    
        >>> dictadd({1: 0, 2: 0}, {2: 1, 3: 1})
        {1: 0, 2: 1, 3: 1}
    """
    result = {}
    for dct in dicts:
        result.update(dct)
    return result
