Task: Question Generation
Input (English): Basketball is also a notable sport in Estonia. Estonia national basketball team previously participated in 1936 Summer Olympics, appeared in EuroBasket four times. Estonia national team also qualified to EuroBasket 2015, which will be held in Ukraine. BC Kalev/Cramo, which participates in EuroCup, is the most recent Korvpalli Meistriliiga winner after becoming champion of the league for the 6th time. Tartu Ülikool/Rock, which participates in EuroChallenge, is the second strongest Estonian basketball club, previously winning Korvpalli Meistriliiga 22 times. Six Estonian basketball clubs participates in Baltic Basketball League.
Output (English): How many Estonian teams are in the Baltic Basketball League?