How many pieces of such small cubes are needed to assemble a large cube with small cubes with side lengths of 4 cm.
用棱长4厘米的小正方体拼成一个大正方体，至少需这样的小正方体多少块．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>