Was M1 M0 's sequel 's sequel 's executive producer 's country of nationality
SELECT count(*) WHERE {
?x0 ns:film.producer.films_executive_produced ?x1 .
?x1 ns:film.film.prequel ?x2 .
?x2 ns:film.film.prequel M0 .
M1 ^ns:people.person.nationality ?x0
}