To make a cuboid frame whose length, width, and height are 6 cm, 5 cm, and 4 cm, at least how many centimeters of iron wire are needed.
做一个长宽高分别为6厘米、5厘米、4厘米长方体框架，至少需要多少厘米长的铁丝．
<gadget id="calculator">6 + 5 + 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>