Was a person influenced by M1 and M2 and influenced by M3 's star and writer
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x0 ns:influence.influence_node.influenced_by M1 .
?x0 ns:influence.influence_node.influenced_by M2 .
?x1 ns:film.actor.film/ns:film.performance.film M3 .
?x1 ns:film.writer.film M3
}