Weld a cuboid model with a length of 5 decimeters, a width of 3 decimeters and a height of 2 decimeters with iron wires, at least how many decimeters of iron wires are needed.
用铁丝焊接一个长5分米、宽3分米、高2分米的长方体模型，至少需用铁丝多少分米．
<gadget id="calculator">5 + 3 + 2</gadget>
<output>10</output>

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

<result>40</result>