Given the task definition and input, reply with output. This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: In week 2, the Lions flew west to play the San Francisco 49ers on Sunday Night Football. The 49ers got on the board first with a 21-yard touchdown pass from Alex Smith to Vernon Davis. The Lions responded with two field goals by Jason Hanson, from 38 and 41 yards respectively. The only scoring play of the second quarter was a 1-yard touchdown run by Frank Gore. In the third quarter came a pair of field goals, first a 36-yard kick by San Francisco's David Akers, and later a 40-yard one from Detroit's Jason Hanson. In the final quarter, both teams kicked two more field goals both from 48 yards out, first the 49ers' David Akers, then the Lions' Jason Hanson. Next, San Francisco's Vernon Davis caught his second touchdown pass of the game, this one from 23 yards out. Lastly, Detroit scored their only touchdown of the game when Brandon Pettigrew caught a 9-yard pass from Matthew Stafford dropping the team to 1-1.
Question: How many field goals did Jason Hanson kick?
Answer type: Number
4.