context: After finishing last season with a league best 15-1 record, the Green Bay Packers began their 2012 campaign against the San Francisco 49ers who finished second to the Packers in the NFC with a 13-3 record. San Francisco delivered the game's opening punch in the first quarter as David Akers converted a 40-yard field goal. The 49ers further extended their lead when veteran WR Randy Moss caught a 17-yard pass in the middle of the end zone from Alex Smith in the 2nd quarter. The Packers scored their first points of the season when Aaron Rodgers connected with TE Jermichael Finley in the center of the endzone on a 1-yard pass. Rodgers and the Packers offense struggled to move the ball and David Akers added two more field goals for the 49ers including a long distance 63-yard field goal that hit the cross bar and bounced through as the 1st half came to an end. The Packers went into the locker room down 16-7.The 49ers continued their scoring in the third quarter with Vernon Davis hauling in a 4-yard pass in the end zone from Alex Smith to further extend the 49ers lead to 23-7. The Packers' managed to chip into the 49ers lead when WR Randall Cobb returned a punt 75 yards for a touchdown. Rodgers completed a pass to Jordy Nelson for the 2-point conversion to bring the lead down to a more manageable 8-point lead.  However, Rodgers threw a costly interception on the Packers next offensive possession which set up the 49ers with great field position. Following the INT, RB Frank Gore scored a touchdown on a 23-yard scamper into the endzone down the right sideline. The Packers drove down and Rodgers completed a 10-yard touchdown pass to James Jones to bring the Packers within 8 points for the second time with a little over 6 minutes remaining in the game. The Packers forced the 49ers to punt with 3:45 remaining on the clock but hope expired on a come from behind victory when Rodgers failed to complete an attempted pass to Jordy Nelson on 4th and 10. The 49ers regained possession and ran out the game clock.With the loss, Green Bay began their season 0-1 matching the Packers regular season losses for all of the 2011 season. Also, this game ended their streak of 13 consecutive regular season victories at Lambeau Field.
question: How many field goals did David Akers kick in the first half?
answer: 3