There are several chess pieces of each of the three colors in the box, at least how many chess pieces are touched, it can be guaranteed that there are 3 chess pieces of the same color.
盒子里有三种颜色的棋子各若干个，至少摸出多少个棋子，就能保证有3个棋子同色．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

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

<result>7</result>