Editorial for COCI '20 Contest 4 #1 Pizza

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

For each pizza we just check if it contains a topping which Mirko dislikes, and if it doesn't we add $1$ ~1~ to the solution.