How much can I expect to spend?

Hey all,

I would like to travel Europe this summer.

I am planning these spots :

France (Paris , Nice) Italy (Rome , The Dolomites , Amalfi Coast) Spain (Barcelona , Tenerife) Croatia (Split)

I am planning to spend 4-5 weeks for the entire trip.

Would anyone know how much I can expect on spending? I would like to keep my budget around 3500 USD, is this possible?

(I would prefer to stay at hostels as AirBNB / Hotel prices are insanely expensive) thanks!!

Thanks!