cube is made up of several small cubes of the same size, and 9 small cubes are arranged on each edge of the cube. Paint red on the surface of the cube, and then remove all the small cubes painted with red; paint yellow on the surface of the resulting new cube, and then remove all the small cubes painted with yellow; paint red on the surface of the new cube, and then remove all Small cubes painted red; repeat this process until all the small cubes are painted with color, how many small cubes are painted yellow?
一个正方体由若干个同样大小的小正方体拼接而成，正+方体的每条棱上排列9个小正方体．在该正方体表便涂红色，然后去掉所有涂有红色的小正方体；在所得的新正方体表面涂上黄色，再去掉所有涂有黄色的小正方体；再在新正方体表便涂红色，然后去掉所有涂有红色的小正方体；如此往复，直到所有的小正方体上都涂上颜色为止，那么涂有黄色的小正方体共有多少个．
<gadget id="calculator">7 * 7 * 7</gadget>
<output>343</output>

<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">343 - 125</gadget>
<output>218</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">27 - 1</gadget>
<output>26</output>

<gadget id="calculator">218 + 26</gadget>
<output>244</output>

<result>244</result>