Put together some small cubes with edge length of 1cm into a cuboid with a length of 3dm, a width of 5cm and a height of 0.8dm, how many such small cubes are needed in total?
将一些棱长为1cm的小正方体拼成一个长3dm，宽5cm，高0.8dm的长方体，共需要多少个这样的小正方体？
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">3 * 10 * 5 * 0.8 * 10</gadget>
<output>1_200</output>

<result>1_200</result>