1821. Hanoi Tower III

单点时限: 2.0 sec

内存限制: 256 MB

A double tower of hanoi contains 2n disks of n different sizes,two of each size.As usual,we’re required to move only one disk at a time,without putting a larger one over a smaller one.

How many moves does it take to transfer a double tower from one peg to another,if disks of equal size are indistinguishable from each other?

输入格式

There are so many tests.Each test have one interger n(1<=n<=60) represented the number of disks.

输出格式

Output a single number of the minimum steps in a line.

样例

Input
1
5
Output
2
62

45 人解决,101 人已尝试。

64 份提交通过,共有 192 份提交。

5.3 EMB 奖励。

创建: 12 年,10 月前.

修改: 3 年,1 月前.

最后提交: 3 周,3 天前.

来源: partychen

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