Use a small cube with an edge length of 3 cm to place a cube, at least how many such small cubes are needed.
用棱长3厘米的小正方体摆一个正方体，至少需要多少块这样的小正方体．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>