Give me a count of all ice hockey players whose teams are headcoached by John Tortorella?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/headCoach> <http://dbpedia.org/resource/John_Tortorella> . ?uri <http://dbpedia.org/ontology/team> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/IceHockeyPlayer>}
John_Tortorella