#include <iostream>
using namespace std;
const long long MOD = 1000000007;
int main(){
	int N;
	cin >> N;
	long long ans = 1;
	for (int i = 1; i <= N * 2; i++){
		ans = ans * i % MOD;
	}
	for (int i = 0; i < N; i++){
		ans = ans * 500000004 % MOD;
	}
	cout << ans << endl;
}