user: Question: What is the highest Week with the Opponent Buffalo Bills?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 12, 1964', 'at New York Jets', 'L 6–30', 'Shea Stadium', '0–1', 45665.0]
SQL:

assistant: SELECT MAX("Week") FROM "Table" WHERE "Opponent" = 'Buffalo Bills';