old_contents: import os
  import threading
  import sys
  port = int(sys.argv[1])
  
  def new_dummy_server():
    global port
    port = port + 1
    os.system('python dummy_vm_server.py ' + str(port))
  def master_server():
    os.system('python master_server.py')
  if __name__ == '__main__':
    t = threading.Thread(target = master_server)
    t.start()
    count = int(sys.argv[2])
    for i in range(count):
      t = threading.Thread(target = new_dummy_server)
      t.start()
    
  
new_contents: import os
  import threading
  import sys
  port = int(sys.argv[1])
  
  def new_dummy_server():
    global port
    port = port + 1
    os.system('python dummy_vm_server.py ' + str(port))
  def master_server():
    os.system('python master_server.py')
  if __name__ == '__main__':
  #  t = threading.Thread(target = master_server)
  #  t.start()
    count = int(sys.argv[2])
    for i in range(count):
      t = threading.Thread(target = new_dummy_server)
      t.start()
    
  
subject: Update start.py