Use iron wire to make a cuboid frame with a length of 8 cm, a width of 5 cm, and a height of 4 cm. What is the minimum number of cm of iron wire needed?
用铁丝做一个长8cm，宽5cm，高4cm的长方体框架，至少需要多少cm铁丝．
<gadget id="calculator">8 + 5 + 4</gadget>
<output>17</output>

<gadget id="calculator">17 * 4</gadget>
<output>68</output>

<result>68</result>