#include <bits/stdc++.h>
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define FORR(i,a,b) for (int i=(a);i>=(b);i--)
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef set<int> si;
const int inf = 1e9;
const int mod = 1e9+7;

ll powMod(ll a, int n, int m){
  ll p = 1;
  while(n > 0){
    if(n & 1) p = p * a % m;
    a = a * a % m;
    n >>= 1;
  }
  return p;
}
main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  ll a = 1, inv = powMod(2, mod - 2, mod);
  FOR(i, 1, 2*n+1)a = a * i % mod;
  cout << a * powMod(inv, n, mod) % mod << endl;
}