cuboid iron sheet with a length of 40 cm and a width of 30 cm is subtracted from each of the four corners to form a box with a side length of 5 cm. What is the volume of this box in milliliters?
一张长40厘米，宽30厘米的长方体铁皮，从4个角分别减去一个边长5厘米的正方形，然后做成一个无盖的盒子，这个盒子的容积是多少毫升．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">30 * 20 * 5</gadget>
<output>3_000</output>

<result>3_000</result>