A door is 20 decimeters long and 10 decimeters wide, and a piece of glass with a length of 3 decimeters and a width of 2 decimeters is installed on it. Now it is necessary to paint the outside of the door with red paint. How many square decimeters is the painted area?
一扇门长20分米，宽10分米，上面安装了一块长3分米，宽2分米的玻璃，现在需要在门的外面刷上红漆，刷漆的面积是多少平方分米？
<gadget id="calculator">600 - 6</gadget>
<output>594</output>

<result>594</result>