Passage: The 2019 AFC Asian Cup was the 17th edition of the AFC Asian Cup, the quadrennial international men's football championship of Asia organised by the Asian Football Confederation (AFC). It was held in the United Arab Emirates from 5 January to 1 February 2019.For the first time, the Asian Cup final tournament was contested by 24 teams, having been expanded from the 16-team format that was used from 2004 to 2015. Under this new format, the finalists would contest a group stage consisting of six groups of four teams, followed by a knockout stage of 16 teams. The host nation qualified for the final tournament automatically, while the remaining 23 places were determined among the other 45 national teams of the AFC through a qualifying competition running from 2015 to 2018, part of which also served as part of the 2018 FIFA World Cup qualification process for the confederation.

Question: How many different teams was the Asian Cup final tournament composed of?
24