Did a person that influenced M1 influence M2 and influence M3 's art director
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced ?x1 .
?x0 ns:influence.influence_node.influenced M1 .
?x0 ns:influence.influence_node.influenced M2 .
?x1 ns:film.film_art_director.films_art_directed M3
}