If a cuboid is 12 meters long, 4 meters wide, and 5 meters high, what is the sum of its sides?
一个长12米，宽4米，高5米的长方体，它的棱长总和是多少米．
<gadget id="calculator">12 + 4 + 5</gadget>
<output>21</output>

<gadget id="calculator">21 * 4</gadget>
<output>84</output>

<result>84</result>