How many movies have Egil Monn-Iversen and Niels Ishøy collaborated on?

They have worked on 4 movies together! Their first movie together was Hennes meget kongelige høyhet (1968) while their highest rated movie together was The Olsen Gang (1969). They have not worked together since Ballad of the Masterthief Ole Hoiland (1970). They are most known for their drama films together.