The Yinqiao milk box is 32 cm long, 20 cm wide, and 12 cm high. To make such a box, at least how many centimeters**2 of hard paper is needed.
银桥牛奶箱长32厘米，宽20厘米，高12厘米，做这样一个箱子，至少需要多少厘米**2的硬纸．
<gadget id="calculator">32 * 20</gadget>
<output>640</output>

<gadget id="calculator">32 * 12</gadget>
<output>384</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">640 + 384 + 240</gadget>
<output>1_264</output>

<gadget id="calculator">1_264 * 2</gadget>
<output>2_528</output>

<result>2_528</result>