A 24cm long iron wire is used to make a cuboid whose width and height are both 1cm. What is the length of the cuboid?
用24cm长的铁丝做成一个宽与高都是1cm的长方体，长方体的长是多少．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<result>4</result>