How many cubes are needed to form a cube with sides of 2 cm from small pieces of cubes with side lengths of 1 cm?
用棱长1cm的正方体小木块拼成一个棱长2cm的正方体，至少需要多少块．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

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

<result>8</result>