Make a rectangular hole in the center of the front, back, top, and left sides of a cube. It is known that the side length of the cube is 8 cm, and the openings on the front, back, top, bottom, and left and right sides are squares with a side length of 3 cm. Find the remaining volume.
在一个正方体的前后、上下、左右面的中心各打通一个长方形的洞．已知正方体棱长为8厘米，前后、上下、左右侧面的洞口是边长为3厘米的正方形，求剩下的体积．
<gadget id="calculator">8 ** 3</gadget>
<output>512</output>

<gadget id="calculator">3 * 3 * 8 * 3</gadget>
<output>216</output>

<gadget id="calculator">512 - 216</gadget>
<output>296</output>

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

<gadget id="calculator">296 + 54</gadget>
<output>350</output>

<result>350</result>