baoshuo/OI-codes
baoshuo/OI-codes
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OI-codes/problem/P1096/P1096.py
Ren Baoshuo 0c2217509e
P1096 Hanoi 双塔问题 
R39866257
2020-10-15 21:17:38 +08:00

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print(2**(int(input())+1)-2)
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