#include <iostream>
using namespace std;

__int128 factorial(__int128 a) {
	__int128 tmp = 1;
	for (__int128 i = 2; i <= a; ++i) tmp *= i;
	return tmp;
}

int main() {
	long tmp;
	cin >> tmp;
	__int128 N = tmp;
	long ans = factorial(2 * N) / (factorial(N + 1) * factorial(N));
	cout << ans;
}