How many movies have Aldo U. Passalacqua and Francesco Gagliardini collaborated on?

They have worked on 4 movies together! Their first movie together was To My Dear Mother on Her Birthday (1974) while their highest rated movie together was Fantozzi: White Collar Blues (1975). They have not worked together since The Second Tragic Fantozzi (1976). They are most known for their comedy films together.