If the length, width, and height of a cuboid are 2 cm, 3 cm, and 4 cm, what is the sum of the lengths of the sides in cm?
一个长方体的长宽高分别是2厘米、3厘米、4厘米，棱长总和是多少厘米．
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>