Better than AI: ask someone who has ordered lots of piazza recently.

You need more than you think as not all pizzas will be the same flavour. The vegetarian ones will get eaten immediately by people who aren’t vegetarian. Then the complaints roll in.

Apply this to various other pizza type.

Order 1 pizza for every two people.

Haven't ordered any piazza recently. Last one I saw was Mike Piazza at a Mets game, so it's been a while.