user: Question: How many Laps have a Grid of 15?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Felipe Massa', 'Ferrari', 71.0, '1:34:11.435', 1.0]
SQL:

assistant: SELECT SUM("Laps") FROM "Table" WHERE "Grid" = 15.0;