A cuboid-shaped bucket without a lid has a length of 4dm, a width of 3dm, and a height of 5dm. How many square decimeters of iron sheet are needed to make this bucket?
一个长方体形状的无盖水桶，长4dm、宽3dm、高5dm，制作这个水桶至少需要铁皮多少平方分米？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 * 5 * 2</gadget>
<output>40</output>

<gadget id="calculator">3 * 5 * 2</gadget>
<output>30</output>

<gadget id="calculator">12 + 40 + 30</gadget>
<output>82</output>

<result>82</result>