There are 5 small balls of red, white, and yellow colors in the bag, at least how many small balls must be taken out of the bag to ensure that there are small balls of three colors in the taken out balls at the same time.
袋子中有红、白、黄3中颜色的小球各5个，至少要从中拿出多少个小球才能保证拿出的球中同时有三种颜色的小球．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>