def fibonacci(n):
  if n < 0: return
  elif n == 1: return 0
  elif n == 2: return 1
  else: return fibonacci(n-1) + fibonacci(n-2)

def fibonacci(n):
  if n < 0: return
  elif n == 1: return 0
  elif n == 2: return 1
  else: return fibonacci(n-1) + fibonacci(n-2)
