A cube with six sides all red, how many cuts must be cut at least to get 180 cubes with all sides not red.
一个六面都是红色的正方体，最少要切多少刀，才能得到180个各个面都不是红色的正方体．
<gadget id="calculator">6 + 5 + 5 + 4</gadget>
<output>20</output>

<result>20</result>