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#include <cstdio>
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using namespace std;
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int main()
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{
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int n;
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while(~scanf("%d",&n))
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{
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int ans=1;
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for(int i=1;i<n;i++)
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ans=((ans+1)<<1);
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printf("%d\n",ans);
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}
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return 0;
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}
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