#include<iostream>
using namespace std;
long M=1e9+7;
long pow(long a,int b){return b?pow(a*a%M,b/2)*(b%2?a:1)%M:1;}
main()
{
	long n,m,ans=1;cin>>n;
	for(m=n*2;m>0;m--)ans=ans*m%M;
	cout<<ans*pow(pow(2,n),M-2)%M<<endl;
}