A cuboid has a length of 5 decimeters, a width of 3 decimeters and a height of 4 decimeters, find the sum of the lengths of all its sides.
一个长方体，长5分米，宽3分米，高4分米，求它的所有棱长的和．
<gadget id="calculator">5 + 3 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>