Was a art director influenced by M3 and M4 and influenced by a person M1
SELECT count(*) WHERE {
?x0 a ns:people.person .
M1 a ns:film.film_art_director .
M1 ns:influence.influence_node.influenced_by ?x0 .
M1 ns:influence.influence_node.influenced_by M3 .
M1 ns:influence.influence_node.influenced_by M4
}