Cut 4 squares (side length 2 cm) from a rectangular cardboard (40 cm long and 20 cm wide) at the four corners to make a wooden box. What is the volume of the wooden box?
把一块长方形的纸板(长40厘米，宽20厘米)在四角剪掉4个正方形(边长2厘米)，制作成一个木盒，木盒容积是多少？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">36 * 16 * 2</gadget>
<output>1_152</output>

<result>1_152</result>