### Instruction: How many national championships has Nick Saban won at Alabama?
### Input: The Alabama Crimson Tide football program represents the University of Alabama (variously Alabama, UA, or Bama) in the sport of American football. The team competes in the Football Bowl Subdivision (FBS) of the National Collegiate Athletic Association (NCAA) and the Western Division of the Southeastern Conference (SEC). The team's head coach is Nick Saban, who has led the Tide to six national championships over his tenure. The Crimson Tide is among the most storied and decorated football programs in NCAA history. Since beginning play in 1892, the program claims 18 national championships, including 13 wire-service (AP or Coaches') national titles in the poll-era, and five other titles before the poll-era. From 1958 to 1982, the team was led by Hall of Fame coach Paul "Bear" Bryant, who won six national titles with the program. Despite numerous national and conference championships, it was not until 2009 that an Alabama player received a Heisman Trophy, when running back Mark Ingram II became the university's first winner. In 2015, Derrick Henry became the university's second Heisman winner. The Crimson Tide won back to back Heisman trophies in 2020 and 2021, with DeVonta Smith and Bryce Young.
### Response: As head coach of the Alabama Crimson Tide football team, Nick Saban has won six national championships. Alabama claims 18 football national championships in the program's history.