How many {influenced by} are to/by {Thomas Hobbes} ?
How many people were influenced by Thomas Hobbes?
Thomas Hobbes influenced how many people?
SELECT ( COUNT ( ?j ) AS ?g ) { ?j property:influenced_by resource:Thomas_Hobbes }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P737> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q37621 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P737 wd:Q37621 }
5