rectangular parallelepiped frame with a length of 3 meters, a width of 2 meters and a height of 2 meters is exactly made with a piece of iron wire of how many meters long.
用一根长多少米的铁丝正好做一个长3米、宽2米、高2米的长方体框架．
<gadget id="calculator">3 + 2 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<result>28</result>