The volume of a large cube painted with red paint on six sides is 27 cubic centimeters, and it is cut into 27 small cubes of 1 cubic centimeter, how many pieces of the small cube are not painted with red paint on any side.
一个六面都涂上红漆的大正方体的体积是27立方厘米，把它的切成27块1立方厘米的小正方体，小正方体任何一个面都没涂红漆的有多少块．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 8</gadget>
<output>1</output>

<gadget id="calculator">1 * 6</gadget>
<output>6</output>

<gadget id="calculator">27 - 8 - 12 - 6</gadget>
<output>1</output>

<result>1</result>