小明发现青青草原上有一群兔子。
设一对兔子一个月生一对小兔子。问,nnn个月有多少对兔子(假设不会死亡)
一行,nnn
一行,代表nnn个有后共有几只兔子
1
3
2
1<=n<=1001 <= n <= 1001<=n<=100
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