How many small cubes are needed to form a cube with sides of 8 cm from cubes with side lengths of 2 cm?
用棱长为2cm的正方体拼成一个棱长为8cm的正方体，至少需要多少个小正方体．
<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<result>64</result>