How many pieces of small cubes like this are needed to form a large cube with small cubes with a side length of 2 cm.
用棱长2厘米的小立方体木块拼成一个大立方体，至少需要这样的小立方体多少块．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>