How many movies have Mario Amendola and Vitaliano Natalucci collaborated on?

They have worked on 4 movies together! Their first movie together was I dritti (1957) while their highest rated movie together was I ragazzi dell'Hully Gully (1964). They have not worked together since I ragazzi dell'Hully Gully (1964). They are most known for their comedy films together.