user: Question: For the 1967 Cleveland Browns season what is the total number of times they played the minnesota vikings and had an atttendance smaller than 68431?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 17, 1967', 'Dallas Cowboys', 'L 21–14', 81039.0]
SQL:

assistant: SELECT COUNT("Week") FROM "Table" WHERE "Opponent" = 'minnesota vikings' AND "Attendance" < 68431.0;