#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	ll res{ 1 };

	for (int i = n + 2; i <= n * 2; ++i)
		res *= i;
	for (int i = 2; i <= n; ++i)
		res /= i;
	cout << res << "\n";

	return 0;
}