A rectangular piece of metal is 40 cm long and 30 cm wide. Cut off a small square with a side length of 5 cm from the four corners and weld it into a cuboid box without a cover. How many milliliters of liquid can this box hold at most?
一块长方形的铁皮，长40厘米，宽30厘米．从四个角都剪掉边长为5厘米的小正方形后，焊成一个无盖的长方体盒子，这个盒子最多能容纳多少毫升的液体？
<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>