(codeup) 1915 : (재귀함수) 피보나치 수열 

n = int(input())

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

print(fibo(n,0))

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