#include <bits/stdc++.h>

using namespace std;
typedef long long LL;
const int p = 1e9 + 7;
int n;

int qmi(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1) res = (LL)res * a % p;
        b >>= 1;
        a = (LL)a * a % p;
    }
    return res;
}

int main() {
    cin >> n;
    int res = 1;

    // ① 分子,2n*(2n-1)*(2n-2)*...*(n+1)
    for (int i = 2 * n; i > n; i--) res = (LL)res * i % p;
    // ② 分母,inv(n+1)*inv(n)*inv(n-1)*...*inv(1) %p
    for (int i = n + 1; i; i--) res = (LL)res * qmi(i, p - 2) % p;
    // 输出
    cout << res << endl;
    return 0;
}