#include<iostream>
using namespace std;
long long N, mod = 1000000007, r = 1;
int main() {
	cin >> N;
	for (int i = 1; i <= N * 2; i++)r *= i, r %= mod;
	for (int i = 1; i <= N; i++) {
		if (r % 2 == 1)r += mod; r /= 2;
	}
	cout << r << endl;
	return 0;
}