A cuboid whose length, width and height are 21 centimeters, 15 centimeters and 12 centimeters, now cut off a cube as large as possible from it, and then cut another cube as big as possible from the remaining part, at this time the remaining What is the volume in cubic centimeters.
一个长、宽和高分别为21厘米、15厘米和12厘米的长方体，现从它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，此时剩下的体积是多少立方厘米．
<gadget id="calculator">21 * 15 * 12</gadget>
<output>3_780</output>

<gadget id="calculator">12 * 12 * 12</gadget>
<output>1_728</output>

<gadget id="calculator">21 - 12</gadget>
<output>9</output>

<gadget id="calculator">9 * 9 * 9</gadget>
<output>729</output>

<gadget id="calculator">3_780 - 1_728 - 729</gadget>
<output>1_323</output>

<result>1_323</result>