user: Question: What is the highest grid that Tetsuya Harada rode in?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Valentino Rossi', 'Honda', 19.0, '38:49.425', 1.0]
SQL:

assistant: SELECT MAX("Grid") FROM "Table" WHERE "Rider" = 'Tetsuya Harada';