A cuboid whose surface is painted red is divided into several small cubes with a side length of 1 cm. Among them, there are 4 small cubes painted red on both sides. What is the minimum volume of this cuboid in cubic centimeters?
一个表面涂成红色的长方体，分割成若干个棱长为1厘米的小正方体，其中两面涂红色的小正方体有4个，那么这个长方体的体积最少是多少立方厘米．
<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<result>12</result>