How many centimeters of iron wire are needed to make a cuboid frame with a length of 3 cm, a width of 2 cm and a height of 2 cm.
做一个长3厘米、宽和高都是2厘米的长方体框架至少需要铁丝多少厘米．
<gadget id="calculator">3 + 2 + 2</gadget>
<output>7</output>

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

<result>28</result>