#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define o(a) cout << a << endl
#define int long long
#define fi first
#define se second
using namespace std;
typedef pair<int, int> P;

const int mod = 1e9 + 7;

long long mod_pow(long long x, long long n){
    if(n == 0) return 1;
    long long res = mod_pow(x*x % mod, n / 2);
    if(n & 1) res = res*x % mod;
    return res;
}

signed main(){
    int n;
    cin >> n;
    int ans = 1;
    rep(i, 1, 2 * n + 1){
        ans = (ans * i) % mod;
    }
    // cout << ans << endl;
    rep(i, 0, n){
        ans = (ans * mod_pow(2, mod - 2)) % mod;
    }
    cout << ans << endl;
}