What is the surface area of three cubes with side lengths of 1 cm arranged in a row?
三个棱长1cm的正方体排成一行，它的表面积是多少．
<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<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>