Question: How many first drivers have participated when Scuderia Ferrari was a first team?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/firstTeam> <http://dbpedia.org/resource/Scuderia_Ferrari> . ?x <http://dbpedia.org/ontology/firstDriver> ?uri  . }
Answer: There are [249] first drivers of the grand prixes whose first team is Scuderia Ferrari.