If the length, width and height of a cuboid are 12 cm, 10 cm and 8 cm respectively, what is the sum of its sides in cm?
长方体的长、宽、高分别是12厘米、10厘米和8厘米，则它的棱长总和是多少厘米．
<gadget id="calculator">12 + 10 + 8</gadget>
<output>30</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<result>120</result>