def read_ints():
  return [int(i) for i in raw_input().split(' ')]

while 1:
  try:
    cnt = read_ints()
    ms = read_ints()
  except:
    break
  
  cnt = 0
  for i in range(len(ms)):
    while ms[i] != i + 1:
      ti = ms[i] - 1
      ms[i], ms[ti] = ms[ti], ms[i]
      cnt += 1

  print(cnt)