The Bills began their 2007 campaign at home against the Denver Broncos. In the first quarter, the Bills struck first with WR/PR Roscoe Parrish returning a punt 74 yards for a touchdown. Then, near the end of the period, the Broncos got on the board with kicker Jason Elam getting a 21-yard field goal. Denver would go on to get the only score of the second quarter, as Elam kicked a 48-yard field goal. On the opening kickoff for the second half, a scary injury occurred to Bills TE Kevin Everett, as he suffered a cervical spine injury. He would end up being carted off the field, and was rushed to Millard Fillmore Gates Hospital for an emergency surgery. It was due to the fastest application of cold ever applied to an injured spine that gave Everett a chance to walk again despite the initial grim prognosis. In the third quarter, Buffalo struck again as rookie RB Marshawn Lynch got a 23-yard TD run. Afterwards, the Broncos pulled within two as QB Jay Cutler completed a 5-yard TD pass to WR Brandon Marshall (followed by a failed 2-Point Conversion). Near the end of the fourth quarter, Cutler drove his team into field goal range and with no timeouts left, Denver's special teams came on and Elam kicked the game-winning 42-yard field goal with no time left on the clock. With the shocking loss, the Bills began the season at 0-1.

Answer this question based on the article: How many field goals did Jason Elam kick in the first half?
2