#include <iostream>
#include <vector>
using namespace std;

vector<int> mul(vector<int>& a, int b) {
    vector<int> c;
    long long carry = 0;
    for (int i = 0; i < a.size() || carry; i++) {
        if (i < a.size()) carry += (long long)a[i] * b;
        c.push_back(carry % 10);
        carry /= 10;
    }
    return c;
}

vector<int> div(vector<int>& a, int b) {
    vector<int> c(a.size(), 0);
    long long r = 0;
    for (int i = a.size() - 1; i >= 0; i--) {
        r = r * 10 + a[i];
        c[i] = r / b;
        r %= b;
    }
    while (c.size() > 1 && c.back() == 0) c.pop_back();
    return c;
}

int main() {
    int n;
    cin >> n;
    vector<int> result;
    result.push_back(1);
    for (int i = 1; i <= n; i++) {
        result = mul(result, n + i);
        result = div(result, i);
    }
    result = div(result, n + 1);
    for (int i = result.size() - 1; i >= 0; i--) {
        cout << result[i];
    }
    cout << endl;
    return 0;
}