This question already has an answer here:
I'm a citizen of Argentina residing in France with a long-stay visa for an internship, valid from September 5th 2018 until January 5th 2019. As an argentinian, I'm allowed to visit Europe as a tourist for up to 3 months without any kind of visa.
Can I stay after my visa expires, by "using" those days, or must I leave on that date? What if I exit the Schengen area and then reenter as a tourist?
I'd only stay for a a few days, about 3, but I guess it doesn't make a difference.