A cuboid bucket without a lid has a length of 5 decimeters, a width of 4 decimeters, and a height of 6 decimeters. How many square decimeters of iron sheets are needed to make such a pair of buckets?
一种无盖的长方体水桶，长是5分米，宽是4分米，高是6分米．做这样一对水桶，至少需要铁皮多少平方分米？
<gadget id="calculator">5 * 6 * 2</gadget>
<output>60</output>

<gadget id="calculator">4 * 6 * 2</gadget>
<output>48</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">60 + 48 + 20</gadget>
<output>128</output>

<gadget id="calculator">128 * 2</gadget>
<output>256</output>

<result>256</result>