#include <iostream>
using namespace std;

int catalan(int a) {
	if (a == 0) return 1;
	int sum = 0;
	for (int i = 0; i < a; ++i) sum += catalan(i) * catalan(a - i - 1);
	return sum;
}

int main() {
	int N;
	cin >> N;
	cout << catalan(N);
}