There is a rectangular iron sheet with a length of 40 cm and a width of 20 cm. If a square with a side length of 5 cm is cut off from each of its four corners, and the remaining part is made into a rectangular parallelepiped container without a cover, what is the volume of this container in cubic centimeters?
有一块长40厘米，宽20厘米的长方形铁皮，如果在它的四角分别切掉一个边长为5厘米的正方形，余下部分做一个无盖长方体容器，这个容器的容积是多少立方厘米．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

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

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

<gadget id="calculator">30 * 10 * 5</gadget>
<output>1_500</output>

<result>1_500</result>