cuboid metal bucket without a cover has a length of 4dm, a width of 3dm, and a height of 1 meter. How much metal should be used to make such a pair of buckets?
一种无盖的长方体形的铁皮水桶，长是4dm，宽是3dm，高1米，做这样的一对水桶至少要用多少铁皮？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 * 1 * 10</gadget>
<output>40</output>

<gadget id="calculator">3 * 1 * 10</gadget>
<output>30</output>

<gadget id="calculator">40 + 30</gadget>
<output>70</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">12 + 140</gadget>
<output>152</output>

<gadget id="calculator">152 * 2</gadget>
<output>304</output>

<result>304</result>