Divide a cuboid whose surface is all red, and divide it into several small cuboids, among which there are only 9 small cuboids with no red on six sides. Then, how many small cuboids are there at least?
将一个表面全部涂有红色的长方体，分割成若干小长方体，其中六个面都没有红色的小长方体只有9个．那么，被分割成的小长方体最少有多少个．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">5 * 5 * 3</gadget>
<output>75</output>

<result>75</result>