Was M0 a Canadian screenwriter that executive produced M2 , M3 , and M4
SELECT count(*) WHERE {
M0 a ns:film.writer .
M0 ns:film.producer.films_executive_produced M2 .
M0 ns:film.producer.films_executive_produced M3 .
M0 ns:film.producer.films_executive_produced M4 .
M0 ns:people.person.nationality ns:m.0d060g
}