Question: Ricky Gervais is the executive producer of the series having how many fictional characters?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:executiveProducer <http://dbpedia.org/resource/Ricky_Gervais> . ?uri onto:series ?x . ?uri rdf:type onto:FictionalCharacter}