How many movies have Hana Hegerová and Lubomír Kostelka acted in together?

They have worked on 4 movies together! Their first movie together was If a Thousand Clarinets (1965) while their highest rated movie together was Ta naše písnička česká (1967). They have not worked together since Sedm žen Alfonse Karáska aneb Když holky berou, já nevím kterou (1967). They are most known for their music films together.