#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <climits>
#include <cmath>
#include <complex>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cassert>
#include <iomanip>
using namespace std;

#define Rep(b, e, i) for(int i = b; i <= e; i++)
#define Repr(e, b, i) for(int i = e; i >= b; i--)
#define rep(n, i) Rep(0, n-1, i)
#define repr(n, i) Repr(n-1, 0, i)
#define all(v) (v).begin(), (v).end()
#define pb(v) push_back(v)
#define uniq(v) (v).erase(unique(all(v)),(v).end())
#define bitcnt(x) __builtin_popcount(x)
#define fst first
#define snd second
#define Pqaz(T) priority_queue<T,vector<T>,greater<T>>
#define Pqza(T) priority_queue<T>
#define put(x) cout << x;
#define putsp(x) cout << x << ' ';
#define putln(x) cout << x << endl;
#define ENJYU std::ios::sync_with_stdio(false);std::cin.tie(0);

typedef long long ll;
typedef pair<ll, ll> llP;
typedef pair<int, int> intP;
typedef complex<double> comp;

//vector の中身を出力
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}

const int MAX = 20000020;
const ll MOD = 1000000007;

//階乗とその逆元
ll fac[MAX+1],facInv[MAX+1];

ll power(ll e, ll x){ //e^x % MOD
	if (x == 0) return 1LL;
	if (x % 2 != 0) return ((power(e, x-1) * e) % MOD);
	ll temp = power(e, x / 2);
	return (temp * temp) % MOD;
}

ll nck(ll n, ll k){
	if (!(n >= k && k >= 0)) return 0;
	ll temp = (fac[n] * facInv[n-k]) % MOD;
	return ((temp * facInv[k]) % MOD);
}

void fact(void){
	//階乗とその逆元
	fac[0] = facInv[0] = 1; //0! = 1
	//(x!)^(-1) ≡ (x!)^(p-2) (mod p)
	Rep(1, MAX, i) fac[i] = (fac[i-1] * i) % MOD;
	facInv[MAX] = power(fac[MAX], MOD-2);
	Rep(1, MAX-1, i) facInv[MAX-i] = (facInv[MAX-i+1] * (MAX-i+1)) % MOD;
}



void solve(void){
	ll N;
	cin >> N;
	fact();
	ll ans = fac[N*2];

	rep(N, i)
	{
		ans *= facInv[2];
		ans %= MOD;
	}

	cout << ans <<endl;
}

int main(void){
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}