question: Did M2 influence M3 , influence M4 and M5 , and influence M1 's American star
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.film M1 .
  ?x0 ns:people.person.nationality ns:m.09c7w0 .
  M2 ns:influence.influence_node.influenced ?x0 .
  M2 ns:influence.influence_node.influenced M3 .
  M2 ns:influence.influence_node.influenced M4 .
  M2 ns:influence.influence_node.influenced M5
  }