#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef unsigned long long ll;
typedef long double ld;
typedef pair<int,int> P;
constexpr int mod = 1e9+7;

int main() {
  ll n;
  cin >> n;
  ll res = 1;
  for (ll i = 2 * n; i >= 1; i--) {
    res *= i;
    if (i % 2 == 0) res /= 2;
    res %= mod;
  }
  cout << res << endl;
  return 0;
}