Divide a cube painted red into several small cubes with a volume of 1 cubic centimeter. Among them, there is only one small cube with no red at all. What is the volume of the original cube?
将一个表面涂有红色的正方体分割成若干个体积为1立方厘米的小正方体，其中一点红色都没有的小正方体只有1块，原来正方体的体积是多少立方厘米．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<result>27</result>