class Screen(object):
    __slots__ = ('__width', '__height')

    def __init__(self, width=0, height=0):
        self.__width = width
        self.__height = height

    @property
    def width(self):
        return self.__width

    @width.setter
    def width(self, value):
        self.__width = value

    @property
    def height(self):
        return self.__height

    @height.setter
    def height(self, value):
        self.__height = value

    @property
    def resolution(self):
        return self.__height*self.__width