Paint a room with a length of 5 meters, a width of 4 meters, and a height of 3 meters (the roof should also be painted). The area of doors and windows in the room is 8 square meters. What is the area that needs to be painted?
刷一间长5米、宽4米、高3米的房间(房顶也要刷)，房间门窗面积是8平方米，需要粉刷的面积是多少？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">5 * 3 * 2</gadget>
<output>30</output>

<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">20 + 30 + 16</gadget>
<output>66</output>

<result>66</result>