How many cubes are needed to form a cube with sides of 2 cm from small cubes with side lengths of 1 cm?
用棱长为1cm的正方体小木块拼成一个棱长为2cm的正方体，需要这样的小木块多少个．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

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

<result>8</result>