I arrive at Charles de Gaulle at 1615 on Wednesday 19th August, and I need to get to the Pullman hotel Chateau de Versailles which is very close to the Versailles-Château-Rive-Gauche station. Looking at the map, I think I need to get the RER B from CdG to St-Michel-Notre-Dame and then change onto RER C5 to Versailles-Château-Rive-Gauche. Is that correct? What are ticket prices likely to be like and can I get a through ticket from CdG?

Thanks very much for any help.