SELECT count(*) FROM game WHERE id NOT IN ( SELECT game_id FROM injury_accident )
How many games are free of injury accidents?
[Schema (values) (types)]: | game_injury |  stadium : id (text) , name (number) , home_games (text) , average_attendance (number) , total_attendance (number) , capacity_percentage (number) | game : stadium_id (text) , id (number) , season (text) , date (number) , home_team (number) , away_team (number) , score (number) , competition (number) | injury_accident : game_id (text) , id (number) , player (text) , injury (number) , number_of_matches (number) , source (number);