Input (grade 13): Up to and including the 2011 Australian Grand Prix, 840 World Championship Grands Prix have been held, including the Indianapolis 500 races which were a part of the World Championships from 1950 until 1960.
Output (grade 12): At the end of the 2008 season, 803 World Championship Grands Prix will have been held including the Indy 500 which was a part of the World Championship from 1950 until 1960.