There is a rectangular piece of cardboard with a length of 50 cm and a width of 30 cm. Cut off a square with a side length of 5 cm from each of the four corners to make a carton. What is the volume of this carton?
有一张长50厘米，宽30厘米的长方形硬纸片，从四个角各剪去边长为5厘米的正方形后做成一个纸盒．这个纸盒的容积是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

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

<gadget id="calculator">40 * 20 * 5</gadget>
<output>4_000</output>

<result>4_000</result>