How many square centimeters of cardboard should be used to make a small gift box with a length of 6cm, a width of 5cm, and a height of 10cm?
做一个小礼物的包装盒，长6cm，宽5cm，高10cm，至少用多少平方厘米的硬纸板？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">30 + 60 + 50</gadget>
<output>140</output>

<gadget id="calculator">140 * 2</gadget>
<output>280</output>

<result>280</result>