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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n,nr=1;
- unsigned long long int p=1;
- cin>>n;
- for(int i=1;i<n;++i)
- nr+=2,p*=nr;
- cout<<p<<'\n';
- return 0;
- }
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