Was a founder of M1 , M2 , and M3 a art director
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:organization.organization_founder.organizations_founded M1 .
?x0 ns:organization.organization_founder.organizations_founded M2 .
?x0 ns:organization.organization_founder.organizations_founded M3
}