To make a cuboid lantern frame with a length of 30cm, a width and a height of 20cm, how many centimeters of wooden strips are needed at least?
制作一个长30cm，宽和高都是20cm的长方体灯笼框架，至少需要多少厘米长的木条？
<gadget id="calculator">30 + 20 + 20</gadget>
<output>70</output>

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

<result>280</result>