Put 4 cubes whose edge length is 1dm into a cuboid, what is the maximum surface area of the cuboid in dm**2.
把4个棱长是1dm的正方体拼成一个长方体，拼成的长方体的表面积最大是多少dm**2．
<gadget id="calculator">4 * 1</gadget>
<output>4</output>

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

<gadget id="calculator">4 + 4 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>