user: Question: What is the total number of Week, when Opponent is at cleveland browns?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 9, 2001', 'New England Patriots', 'W 23–17', '51,521']
SQL:

assistant: SELECT COUNT("Week") FROM "Table" WHERE "Opponent" = 'at cleveland browns';