#include<bits/stdc++.h>
using namespace std;
int c[105];
int main(){
	c[0] = c[1] = 1;
	for(int i = 2;i <= 20;i++){
		c[i] = c[i - 1] * (4 * i - 2) / (i + 1);
	}
	long long n;
	cin >> n;
	cout << c[n];
	return 0;
}