Answer based on context:

The Green Bay Packers beat the Atlanta Falcons, 25-14, in a matchup at the Georgia Dome in Atlanta, GA in the NFL week 5 edition of Sunday Night Football. The Falcons received the opening kickoff and took the ball 80 yards in just under 7 minutes to jump out to an early 7-0 lead on a QB Matt Ryan to WR Roddy White touchdown connection. On the ensuing possession, Green Bay drove into Atlanta territory but Atlanta CB Brent Grimes forced a fumble from Green Bay RB Ryan Grant. The Falcons once again took the ball down the field for a touchdown, this time on a RB Michael Turner 1-yard run, and with just over 12 minutes remaining in the second quarter, Atlanta led 14-0. Green Bay cut the lead to 14-6 at the half on a pair of second-quarter field goals by K Mason Crosby. In the second half it was all about the Green Bay defense which posted a shutout in the final 42 minutes of the game. Midway through the third quarter, Crosby boomed a 56 yarder to cut it to 14-9. Then after a stand by the Packer defense, Packers QB Aaron Rodgers hooked up with WR James Jones on a 70-yard touchdown that put the Packers ahead for good 15-14 (failed 2-pt conv.). On the first play of the fourth quarter Rodgers went to work again and hooked up with WR Greg Jennings on a 29-yard touchdown and Crosby added his fourth field goal with 1:10 remaining to seal it for the visiting Packers. Green Bay QB Aaron Rodgers completed 26 of 39 passes for 396 yards and 2 TD's to lead the offense and remain the early season favorite for MVP. Atlanta QB Matt Ryan struggled, completing 18 of 32 passes for 167 yards, with a TD and 2 INT (by S Charlie Peprah & CB Jarrett Bush). With the win, Green Bay improved to 5-0 as the defending Super Bowl Champions went to Atlanta and dealt them another defeat at home. This coming off a decisive 48-21 Green Bay victory in last years NFC divisional round, also in Atlanta. The Falcons drop to 2-3 with the loss and host the Carolina Panthers next Sunday. Green Bay returns to Lambeau Field to take on the winless St. Louis Rams.

How many yards was Crosby's longest field goal?
56