Was a production company founded by M4 's employee , founded by M1 and M2 , and founded by M3
SELECT count(*) WHERE {
?x0 a ns:film.production_company .
?x0 ns:organization.organization.founders ?x1 .
?x0 ns:organization.organization.founders M1 .
?x0 ns:organization.organization.founders M2 .
?x0 ns:organization.organization.founders M3 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}