A cuboid wooden block with a length of 20cm, a width of 15cm, and a height of 8cm is sawn from this block to the largest cube every time. What is the remaining volume after sawing three times?
一个长20cm、宽15cm、高8cm的长方体木块，每次都从这个木块中锯下一个最大的正方体．锯三次后，剩下的体积是多少？
<gadget id="calculator">20 * 15 * 8</gadget>
<output>2_400</output>

<gadget id="calculator">8 ** 3</gadget>
<output>512</output>

<gadget id="calculator">512 * 2</gadget>
<output>1_024</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

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

<gadget id="calculator">4 ** 3</gadget>
<output>64</output>

<gadget id="calculator">2_400 - 1_024 - 64</gadget>
<output>1_312</output>

<result>1_312</result>