CREATE TABLE table_name_12 (week VARCHAR, opponent VARCHAR, attendance VARCHAR)

How many weeks have an Opponent of at san francisco 49ers, and an Attendance smaller than 34,354?
SELECT COUNT(week) FROM table_name_12 WHERE opponent = "at san francisco 49ers" AND attendance < 34 OFFSET 354
SELECT COUNT("week") FROM "table_name_12" WHERE "at san francisco 49ers" = "opponent" AND "attendance" < 34 OFFSET 354