If two cubes with side lengths of 1 cm are put together to form a cuboid, what is the sum of the side lengths of the cuboid in cm?
把两个棱长1厘米的正方体拼成一个长方体，这个长方体的棱长总和是多少厘米．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>