user: Question: Name the total number of races for 15th position
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'FLaps', 'Podiums', 'Points', 'Position']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [2008.0, 'German Formula Three', 'van Amersfoort Racing', 18.0, 2.0, 3.0, 2.0, 9.0, '85', '4th']
SQL:

assistant: SELECT SUM("Races") FROM "Table" WHERE "Position" = '15th';