How many city-based franchises are featured in the competition of which the "2016–17 Cool & Cool Present Jazz National T20 Cup" was the thirteenth season?
2016–17 National T20 Cup: The 2016–17 Cool & Cool Present Jazz National T20 Cup was a Twenty20 domestic cricket competition in Pakistan that took place in August and September 2016 with eight teams competing. 2016–17 National T20 Cup:  It was the thirteenth season of the National Twenty20 Cup in Pakistan. National Twenty20 Cup:  Established in 2005, it is one of the world's oldest Twenty20 cricket leagues and was replaced by the Pakistan Super League in 2016, which currently features 5 city-based franchises from within Pakistan.
5