Răspunsuri

2014-10-20T14:26:47+03:00
# include<iostream>
using namespace std;
int main()
{
    unsigned n,i,p=1;
    cin>>n;
    for(i=1;i<=2*n;i++)
      if(i%2==0)
         p*=i;
    cout<<p;
    return 0;
}


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