#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <vector>
#include <queue>
#include <functional>
#include <math.h>
#include <string.h>

using std::endl;
using std::string;

#define ll long long int
#define LEP(a, n) for(ll a = 0; a < n; ++a)
#define INF 123456789012345
#define OUT std::cout
#define IN std::cin
#define itn int
#define fro for
#define sdt std

ll N;

ll factorial(ll start, ll end) {
	ll tmp = 1;
	for (ll a = start; a > end; --a) {
		tmp *= a;
	}
	return tmp;
}

int main() {
	IN >> N;
	OUT << factorial(2 * N, N + 1) / factorial(N, 0) << endl;


	return 0;
}