There is a cube with a side length of 10 cm, and a 3 cm square hole is pierced in the center of its upper, left, and front faces until it reaches the opposite side. Find the volume of the block after perforation.
有一个棱长是10厘米的正方体木块，在它的上、左、前三个面中心分别穿一个3厘米见方的孔，直至对面．求穿孔后木块的体积．
<gadget id="calculator">10 * 10 * 10</gadget>
<output>1_000</output>

<gadget id="calculator">3 * 3 * 10</gadget>
<output>90</output>

<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">3 * 3 * 3 * 2</gadget>
<output>54</output>

<gadget id="calculator">270 - 54</gadget>
<output>216</output>

<gadget id="calculator">1_000 - 216</gadget>
<output>784</output>

<result>784</result>