Audi A6 1999 flat tire
 

I just got a flat tire on my Audi A6 1999. The tire is not repairable.

Do I need to replace all 4 tires? Or just one tire or the front two tires?

No idea what to do. Of course, I don't want to spend too much money on this but I don't want to create more expensive problems for this car.

I would really appreciate your professional suggestions! Thanks!

How many miles are on the other tires? If they have low mileage (<15k), you can probably just replace the front two.