old_contents: import math
  
new_contents: import math
  def fibo(index):
     if index >2:
        return fibo(index-1)+fibo(index-2)
      elif index ==2:
        return 1
      elif index ==1:
        return 0
  if __name__=="__main__":
     temp = int(input('please input a num(num>2):'))
      print fibo(index)
  
subject: Update question4.py