Cut off four small squares with a side length of 3 cm from the four corners of a piece of iron sheet with a length of 26 cm and a width of 20 cm, and then weld it into a rectangular iron box. What is the volume of the box in cubic centimeters?
从一块长26厘米，宽20厘米的铁皮的四角剪去四个边长是3厘米的小正方形，再焊接成长方体铁盒，这个盒子的容积是多少立方厘米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">26 - 6</gadget>
<output>20</output>

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<gadget id="calculator">20 * 14 * 3</gadget>
<output>840</output>

<result>840</result>