There are 4 red pencils and 3 blue pencils in the drawer. If you take it with your eyes closed, how many pencils must you find at a time to ensure that there is at least 1 blue pencil.
抽屉里有4支红铅笔和3支蓝铅笔，如果闭着眼睛拿，一次必须摸出多少支铅笔，才能保证至少有1支蓝铅笔．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>