A cuboid cardboard box is 10 cm long, 7 cm wide, and 5 cm high. How many square centimeters of cardboard do you need to make such a cardboard box? (excluding interface)
一种长方体硬纸盒，长10厘米，宽7厘米，高5厘米，做这样的一个硬纸盒至少需要硬纸多少平方厘米？(不计接口)
<gadget id="calculator">10 * 7 * 2</gadget>
<output>140</output>

<gadget id="calculator">7 * 5 * 2</gadget>
<output>70</output>

<gadget id="calculator">5 * 10 * 2</gadget>
<output>100</output>

<gadget id="calculator">140 + 70 + 100</gadget>
<output>310</output>

<result>310</result>