Question: Ateletico De Kolkata plays in a league that has how many teams ?

Context articles: Rabindra Sarobar Stadium
Indian Super League
CA Pinto
2016 Indian Super League Final
Nallappan Mohanraj
ATK (football club)
Sports in Philadelphia
2015 Indian Super League season
Jose Ramirez Barreto
Harshavardhan Neotia

The Rabindra Sarobar Stadium is a multi-use stadium in Kolkata, India.
 It is used for football matches and it serves as the home of Tollygunge Agragami of the Calcutta Football League.
 The venue opened in 1961.
 It also was the home ground of Indian Super League club Atletico de Kolkata.
The Indian Super League (ISL) is a men's professional football league in India.
 For sponsorship reasons, the league is officially known as the Hero Indian Super League.
 One of the top football leagues in the country, it currently shares the top spot in the Indian football league system with the I-League.
 The league comprises 10 teams and will run for five months from November to March starting with the 2017–18 season.
Club Atlético de Pinto is a Spanish football team based in Pinto, in the autonomous community of Madrid.
 Founded in 1963 it plays in Tercera División – Group 7, holding home matches at "Estadio Amelia del Castillo", which has a capacity of 2,500 spectators.The team had beaten Atlético de Kolkata before the rival went on to be 2016 Indian Super League season champions.
 Pinto had beaten them by 4-3 where Manu Sanchez , Nico Ybarra and Dani Ramos were the goalscorers.
The 2016 Indian Super League Final was a football match between Atlético de Kolkata and Kerala Blasters on 18 December 2016 at the Jawaharlal Nehru Stadium in Kochi, Kerala.
 It was the final match of the 2016 Indian Super League season, the third season of the Indian Super League.
 The match was the second time these two teams played each other in the Indian Super League final after both sides met in the inaugural 2014 final.
 Atlético de Kolkata won that final 1–0.
Nallappan Mohanraj (born 23 February 1989, in Namakkal, Tamil Nadu) is an Indian football player.
 He is currently playing for Atletico de Kolkata in the Indian Super League in India as a Left Back
ATK (Previously known as Atlético de Kolkata), is an Indian Super League football franchise based in Kolkata, West Bengal.
 It was established on 7 May 2014 as the first team in the league, and plays its home games at the Salt Lake Stadium.
Philadelphia, Pennsylvania, has been home to many teams and events in professional, semi-professional, amateur, college, and high-school sports.
 Philadelphia is one of twelve cities that hosts teams in all four major sports leagues in North America, and Philadelphia is one of just three cities in which one team from every league plays within city limits.
 These major sports teams are the Philadelphia Phillies of Major League Baseball, the Philadelphia Eagles of the National Football League, the Philadelphia 76ers of the National Basketball Association and the Philadelphia Flyers of the National Hockey League.
 Each team has played in Philadelphia since at least the 1960s, and each team has won at least one championship.
 Since 2010, Philadelphia has been the home of the Philadelphia Union of Major League Soccer which plays in suburban Chester, Pennsylvania, making the Philadelphia market one of nine cities that hosts a team in the four major sports leagues and the MLS.
 Philadelphia hosts several college sports teams, including the Philadelphia Big 5 schools and Temple's Division I FBS football team.
 Many of these teams have fan bases in both Philadelphia and the surrounding Delaware Valley.
 In addition to the major professional and college sports, numerous semi-pro, amateur, community, and high school teams play in Philadelphia.
 The city hosts numerous sporting events, such as the Penn Relays and the Collegiate Rugby Championship, and Philadelphia has been the most frequent host of the annual Army-Navy football game.
 Philadelphia has also been the home of several renowned athletes and sports figures.
 Philly furthermore has played a historically significant role in the development of cricket and extreme wrestling in the United States.
The 2015 Indian Super League Season was the second season of the Indian Super League, a professional football league played in India since 2014.
 The season features eight teams.
 The regular season kicked-off on 3 October and ended on 6 December, while the finals began on 11 December, which will conclude with the final match on 20 December.
 The defending champions Atlético de Kolkata were eliminated in the semi-finals by Chennaiyin.
 The final was played between Goa and Chennayin on 20 December 2015 at the Fatorda Stadium in Goa.
 Chennayin were crowned as champions defeating Goa 3-2 in the final.
José Marcio Ramirez Barreto (born September 3, 1976 in Bagé, Brazil) is the previous assistant coach of Atlético de Kolkata and a former Brazilian football player who played for Mohun Bagan AC, a Club of Kolkata which is popular for its tent on the bank of river Ganga as a midfielder and later for Bhawanipore before being called up his retirement from football in the season 2014.
Harshavardhan Neotia (born on 19 July 1961) is the current chairman of the Ambuja Neotia Group, a corporate house headquartered in Kolkata.
 He is also one of the co-owners of Atletico de Kolkata , which is an Indian Super League football team along with Sourav Ganguly, Sanjeev Goenka, Utsav Parekh and Santosh Shaw.