If three cubes of 1 cubic decimeter are put together to form a cuboid, what is the surface area of it?
三个1立方分米的正方体拼成一个长方体，它表面积是多少平方分米．
<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>