If a carpenter makes a drawer with a length of 50 cm, a width of 40 cm, and a depth of 16 cm, at least how many square centimeters of wooden boards should be used.
木工做一个长50厘米，宽40厘米，深16厘米的抽屉，至少要用木板多少平方厘米．
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 16 * 2</gadget>
<output>1_600</output>

<gadget id="calculator">40 * 16 * 2</gadget>
<output>1_280</output>

<gadget id="calculator">2_000 + 1_600 + 1_280</gadget>
<output>4_880</output>

<result>4_880</result>