A cuboid whose length, width and height are 21 cm, 15 cm and 13 cm respectively, now cut off a cube as large as possible from its top, then cut another cube as large as possible from the remaining part, and finally from the first Cut out a cube as large as possible from the remainder of the quadratic. What is the remaining volume in cubic centimeters?
一个长、宽和高分别为21厘米、15厘米和13厘米的长方体，现从它的上面尽可能大地切下一个正方体，然后从剩余的部分再尽可能大地切下一个正方体，最后再从第二次剩余的部分尽可能大地切下一个正方体，剩下的体积是多少立方厘米？
<gadget id="calculator">21 * 15 * 13</gadget>
<output>4_095</output>

<gadget id="calculator">13 * 13 * 13</gadget>
<output>2_197</output>

<gadget id="calculator">21 - 13</gadget>
<output>8</output>

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

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 * 7 * 7</gadget>
<output>343</output>

<gadget id="calculator">4_095 - 2_197 - 512 - 343</gadget>
<output>1_043</output>

<result>1_043</result>