There are 6 red pens and 8 blue pens in the box, at least how many pens are found must have two colors.
盒子里有6支红笔，8支蓝笔，至少摸出多少支一定有两种颜色．
<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>