Was a film producer influenced by a director , writer , and editor of M1
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x1 ns:film.director.film M1 .
?x1 ns:film.editor.film M1 .
?x1 ns:film.writer.film M1
}