How many movies have Armando Trovajoli and Roberto D'Ettorre Piazzoli collaborated on?

They have worked on 4 movies together! Their first movie together was Adultery Italian Style (1966) while their highest rated movie together was Il marito è mio e l'ammazzo quando mi pare (1968). They have not worked together since Faustina (1968). They are most known for their comedy films together.