How many movies have Marcello Olasio and Pasquale Festa Campanile collaborated on?

They have worked on 3 movies together! Their first movie together was A Maiden for the Prince (1965) while their highest rated movie together was Il marito è mio e l'ammazzo quando mi pare (1968). They have not worked together since Il marito è mio e l'ammazzo quando mi pare (1968). They are most known for their comedy films together.