#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
ll powmod(ll x,ll n){
    if(n == 0)return 1;
    ll ans = powmod(x*x%MOD,n/2);
    if(n % 2)ans = ans * x % MOD;
    return ans;
}
ll divmod(ll a,ll b){
    return ((a%MOD) * (powmod(b,MOD-2)%MOD)) % MOD;
}
main(){
    ll N,A = 1,B = 1;
    cin >> N;
    rep(i,1,N*2+1)A = (A * i) % MOD;
    rep(i,0,N)B = (B * 2) % MOD;
    cout << divmod(A , B) << endl;
}