Given this paragraph, show me how to calculate how many total patrons can be served by all of the Schauspielhaus theaters?

Context: The Schauspielhaus Zürich is one of the most prominent and important theatres in the German-speaking world. It is also known as "Pfauenbühne". The large theatre has 750 seats. The Schauspielhaus also operates three stages in the Schiffbau in the western part of Zürich, the Schiffbau/Halle, the Schiffbau/Box and the Schiffbau/Matchbox.

Answer: 1430 total patrons can be served. There are 750 seats in Schauspielhaus Zürich, 400 in the Schiffbau/Halle, 200 in the Schiffbau/Box and 80 in the Schiffbau/Matchbox. This totals to 750 + 400 + 200 + 80 = 1430 seats. Each patron requires one seat