How many {has grammatical person} are for {Czech} ?
How many people support Czechoslovakia?
SELECT ( COUNT ( ?u ) AS ?s ) { resource:Czech property:has_grammatical_person ?u }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q9056> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P5110> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q9056 wdt:P5110 ?obj }
9