Was a film written by M1 , M2 , M3 , and M4 and directed by a art director
SELECT count(*) WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.directed_by ?x1 .
?x0 ns:film.film.written_by M1 .
?x0 ns:film.film.written_by M2 .
?x0 ns:film.film.written_by M3 .
?x0 ns:film.film.written_by M4 .
?x1 a ns:film.film_art_director
}