A cuboid drawer is 50 centimeters long, 40 centimeters wide and 16 centimeters wide, at least how many boards are used to make it.
长方体抽屉长50厘米，宽40厘米、宽16厘米，至少用多少木板才能做成．
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 16</gadget>
<output>800</output>

<gadget id="calculator">40 * 16</gadget>
<output>640</output>

<gadget id="calculator">800 + 640</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 * 2</gadget>
<output>2_880</output>

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

<result>4_880</result>