Paint the surface of a toolbox with a length of 50 cm, a width of 40 cm, and a height of 35 cm. What is the area to be painted? (the bottom surface is not painted)
将一个长50厘米、宽40厘米、高35厘米的工具箱表面涂上油漆，需要涂漆的面积是多少？(底面不涂)
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 35 * 2</gadget>
<output>3_500</output>

<gadget id="calculator">40 * 35 * 2</gadget>
<output>2_800</output>

<gadget id="calculator">2_000 + 3_500 + 2_800</gadget>
<output>8_300</output>

<result>8_300</result>