Originally Posted by
JohnDoeDE
Be sure to get a ticket from the ticket machine before boarding the train. For a single-ticket press "3" (2,85 €) and be aware that you have sufficient coins on hand (the ticket machine only takes 5 € & 10 € bills!).
Don't confuse the OP please.
He does not have to buy a separate ticket for the S-Bahn if he has a ticket to Berlin.