input: def Fibonacci(n: int) -> int:
      """
      Generate the nth number in the Fibonacci sequence.
      
      >>> Fibonacci(1)
      0
      >>> Fibonacci(2)
      1
      >>> Fibonacci(3)
      1
      >>> Fibonacci(4)
      2
      >>> Fibonacci(5)
      3
      """
      if n == 1:
          return 0
      elif n == 2:
          return 1
      else:
          return Fibonacci(n - 1) + Fibonacci(n - 2)
output:     if n == 1:
          return 0
      elif n == 2:
          return 1
      else:
          return Fibonacci(n - 1) + Fibonacci(n - 2)