CREATE TABLE table_65450 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

How many weeks have an Opponent of at san francisco 49ers, and an Attendance smaller than 34,354?
SELECT COUNT("Week") FROM table_65450 WHERE "Opponent" = 'at san francisco 49ers' AND "Attendance" < '34,354'
SELECT COUNT("Week") FROM "table_65450" WHERE "Attendance" < '34,354' AND "Opponent" = 'at san francisco 49ers'