There is a rectangular iron sheet with a length of 40 cm and a width of 30 cm. Cut out an equal small square at each of its four corners to make a rectangular parallelepiped iron sheet box with a depth of 5 cm (the thickness of the welding part is not counted). What is the volume in cubic centimeters of the tin box?
现有一张长40厘米、宽30厘米的长方形铁皮，在它的四角各剪去一个相等的小正方形，做成一个深是5厘米的长方体无盖铁皮盒(焊接处厚度不计)．做的铁皮盒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">30 - 10</gadget>
<output>20</output>

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

<result>3_000</result>