How many small cubes are needed to assemble a cuboid with a length of 8cm, a width of 5cm and a height of 3cm by using small cubes with an edge length of 1cm?
用棱长1cm的小正方体木块拼成长8cm、宽5cm、高3cm的长方体，一共要用多少块小正方体．
<gadget id="calculator">8 * 5 * 3</gadget>
<output>120</output>

<result>120</result>