A local television station sent out questionnaires to determ…

A local television station sent out questionnaires to determine if viewers would rather see a documentary, an interview show, or reruns of a game show. There were 850 responses with the following results:  255 were interested in an interview show and a documentary, but not reruns; 34 were interested in an interview show and reruns but not a documentary; 119 were interested in reruns but not an interview show; 204 were interested in an interview show but not a documentary; 85 were interested in a documentary and reruns; 51 were interested in an interview show and reruns; 68 were interested in none of the three.  How many are interested in exactly one kind of show?