往届 ACM 队训练题 (参考)

1023. Hanoi Tower IV

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.

What if we are required to reproduce the original top-to-bottom order of all the equal-size disks in the final arrangement?

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
3
123
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