How many small cubes with side lengths of 2 cm can be used to form a cube with side lengths of 4 cm.
用多少个棱长2厘米的小正方体，可以组成一个棱长为4厘米的正方体．
<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

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

<gadget id="calculator">64 / 8</gadget>
<output>8</output>

<result>8</result>