Was M1 a film director that was influenced by a cinematographer and was influenced by M3 and M4
SELECT count(*) WHERE {
?x0 a ns:film.cinematographer .
M1 a ns:film.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
}