A group of college students were asked about their TV watching habits. Of those surveyed, 29 students watch The Walking Dead, 22 watch The Blacklist, and 22 watch Game of Thrones. Additionally, 11 watch The Walking Dead and The Blacklist, 13 watch The Walking Dead and Game of Thrones, and 10 watch The Blacklist and Game of Thrones. There are 6 students who watch all three shows. How many students surveyed watched at least one of the shows