#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
typedef long long LL;
LL qmi(LL a, LL k, LL p) {
    LL res = 1;
    while (k) {
        if (k & 1)
            res = (LL)res * a % p;
        a = (LL)a * a % p;
        k >>= 1;
    }
    return res;
}
LL qjie(LL x, LL p) {
    LL ans = 1;
    for (LL i = 1; i <= x; ++i) {
        ans = ans * i;
        ans = ans % p;
    }
    return ans;
}
int main() {
    freopen("led.in", "r", stdin);
    freopen("led.out", "w", stdout);
    LL n;
    cin >> n;
    cout << (qjie(2 * n, MOD)) / (qmi(2, n, MOD)) % MOD << endl;
    return 0;
}