There is a cuboid painted red and cut into small cubes with a side length of 1 cm. There are exactly 4 small cubes with red sides, and no three sides are red, and no five sides are red. Then the original cuboid What is the volume in cubic centimeters.
有一个表面涂红色的长方体切割成棱长为1厘米的小正方体，恰好有4个小正方体的四面是红色的，而且不存在三面是红色的，也不存在五面是红色的，那么原长方体的体积是多少立方厘米．
<gadget id="calculator">2 * 2 * 1</gadget>
<output>4</output>

<result>4</result>