There are 3 red pencils, 4 blue pencils, and 5 yellow pencils in the box. If you touch once with your eyes closed, how many pencils must you touch to ensure that there is at least 1 yellow pencil.
盒子里有3支红铅笔，4支蓝铅笔，5支黄铅笔，如果闭着眼睛摸一次，必须摸多少支才能保证至少有1支黄铅笔．
<gadget id="calculator">3 + 4 + 1</gadget>
<output>8</output>

<result>8</result>