A square piece of paper with a side length of 30 cm, cut 4 small squares of the same size from its 4 corners (the side length of the small square is a whole centimeter), and fold the remaining part into a rectangular parallelepiped without a cover Paper box, what is the maximum capacity of this paper box?
一个边长30厘米的正方形纸片，从它的4个角上剪去4个同样大小的小正方形(小正方形的边长是整厘米数)，将剩下的部分折成一个无盖的长方体纸盒，这个纸盒的最大容积是多少？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

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

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">400 * 5</gadget>
<output>2_000</output>

<result>2_000</result>