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n=10**10010
a=p=2*n
i=1
while a:a=a*i/(2*i+1);p+=a;i+=1
print`p`[input()+1]

Success #stdin #stdout 1.33s 8976KB

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https://ideone.com/xuf3qa

language:

Python (cpython 2.7.16)

created:

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secret

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