Did a British screenwriter 's country of nationality employ M0 , employ M1 and M2 , and employ M3
SELECT count(*) WHERE {
?x0 ^ns:people.person.nationality ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x1 a ns:film.writer .
?x1 ns:people.person.nationality ns:m.07ssc
}