How many movies have Gustav Oplustil and Miloš Kopecký collaborated on?

They have worked on 13 movies together! Their first movie together was Svatební cesta aneb Ještě ne, Evžene! (1966) while their highest rated movie together was Jak se dělá divadlo (1970). They have not worked together since Poslední leč Alfonse Karáska (1987). They are most known for their comedy films together.