A cuboid classroom is 30 meters long, 10 meters wide, and 3.5 meters high. If its walls and roof are to be painted, 8 square meters of doors and windows are excluded. How many square meters is the area to be painted?
一个长方体教室长30米，宽10米，高3.5米，粉刷它的四壁和房顶，除去门窗8平方米，要粉刷的面积是多少平方米？
<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">30 * 3.5 * 2</gadget>
<output>210</output>

<gadget id="calculator">10 * 3.5 * 2</gadget>
<output>70</output>

<gadget id="calculator">70 - 8</gadget>
<output>62</output>

<gadget id="calculator">300 + 210 + 62</gadget>
<output>572</output>

<result>572</result>