Was a person 's actor M0 's executive producer and star
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.character ?x1 .
?x0 ns:film.actor.film/ns:film.performance.film M0 .
?x0 ns:film.producer.films_executive_produced M0 .
?x1 a ns:people.person
}