There are 3 red pens and 2 black pens in the pen container. If you touch your eyes once, how many pens must you take out to ensure that there is 1 red pen?
笔筒里有3支红笔和2支黑笔，如果蒙上眼睛摸一次，至少拿出几支笔才能保证有1支红笔？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>