题解 | #Fibonacci#
Fibonacci
https://www.nowcoder.com/practice/17ad6908e36a49f4b06ea96936e8bb25
def cal_num(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return cal_num(n-1)+cal_num(n-2)
num = eval(input())
print(cal_num(num))
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