 Complete the following phrase:  Following the resignation of Rick Pitino, the Celtics saw modest improvement under coach Jim OBrien. Paul Pierce matured into an NBA star and was ably complemented by Antoine Walker and the other players acquired over the years. While the team was 1221 when Pitino left, OBriens record to finish the season was 2424. Following the 200001 season OBrien was given the job of head coach on a permanent basis. As a result of numerous trades, the Celtics had three picks in the 