Tablet recommendation for taking notes.

I am a university engineering student and I notice that my friends are very comfortable taking notes with tablets, so I would like to buy one too, but I don't know anything about the tablet market.

Starting from how much I want to spend, the maximum budget is €1,000. I don't want to spend too much, a good price would be around €500, but if you advise me to spend a few euros more, for example one model than another, for reliability and long life, I will gladly do so.

Important requirement: the pen! Since I need it to take notes on math subjects, the digital pen is essential.

The size must be average, I don't want a 14'' that would be uncomfortable to carry around, but even a small screen would be uncomfortable for reading and writing.

I don't necessarily need high performance for gaming or good cameras for photos.