What is the minimum surface area of a cuboid made of 4 cubes whose sides are 2 decimeters long?
用4个棱长2分米的正方体拼成一个长方体，这个长方体的表面积最小是多少．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">16 + 8 + 8</gadget>
<output>32</output>

<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<result>64</result>