How many mountain are there in Sierra Nevada range?
SELECT DISTINCT COUNT(?uri) WHERE {?uri <http://dbpedia.org/ontology/mountainRange> <http://dbpedia.org/resource/Sierra_Nevada_(U.S.)>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Mountain>}
Sierra_Nevada_(U.S.)