How many small cubes of 1 cubic centimeter are stacked to form a large cube?
用1立方厘米的小正方体堆成一个大正方体，至少需要多少个．
<gadget id="calculator">1 * 1 * 1</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

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

<result>8</result>