user: Question: What's the total grid of bruce mclaren?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Jochen Rindt', 'Lotus - Ford', 108.0, '1:57:56.84', 1.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Driver" = 'bruce mclaren';