To make a cuboid lantern frame with a length of 30 cm, a width of 20 cm, and a height of 20 cm, how many centimeters of wood do you need at least?
制作1个长30厘米，宽20厘米，高20厘米的长方体灯笼框架，至少需要多少厘米的木条．
<gadget id="calculator">30 + 20 + 20</gadget>
<output>70</output>

<gadget id="calculator">70 * 4</gadget>
<output>280</output>

<result>280</result>