#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <typeinfo>
#include <fstream>
#include <climits>
#include <functional>

#define REP(i,n) for(int i = 0;i < n;i++)

using namespace std;
typedef long long ll;
const int INF = INT_MAX / 4;
const int p = 1e9 + 7;

const ll inv_elem_2 = 500000004;


int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N;
  cin >> N;

  ll res = 1;
  for(int i = 2;i <= N * 2;i++) {
    res = (res * i) % p;
  }
  REP(i, N) res = (res * inv_elem_2) % p;

  cout << res << "\n";
  return 0;
}