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def fun(n):
if n <= 2:
return 1
else:
return 2*(fun(n - 1) + fun(n - 2))
a = int(input('请输入月份:')) # 获取输入的月数
b = round(fun(a - 1) / fun(a),3) # 计算前一个月与本月兔子数量的比值
log = fun(a)
print(log,'%.3f'% b)
