A cuboid has a length of 8 cm, a width of 7 cm, and a height of 5 cm. What is the sum of the lengths of its sides in cm?
一个长方体，它的长是8厘米，宽是7厘米，高是5厘米，它的棱长总和是多少厘米．
<gadget id="calculator">8 + 7 + 5</gadget>
<output>20</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>