How many {bug tracking system} are for {Tencent QQ} ?
how many bug tracking systems does tencent qq have?
SELECT (COUNT(?obj) AS ?value ) { wd:Q857640 wdt:P1401 ?obj }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q857640> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1401> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

What is the number of bug tracking systems that tencent qq has?