/* -*- coding: utf-8 -*-
 *
 * 790.cc:  No.790 ちきんの括弧並べ - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 13;
const int MAX_N2 = MAX_N * 2;

/* typedef */

/* global variables */

int dp[MAX_N2 + 1][MAX_N + 1];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int n2 = n * 2;
  dp[0][0] = 1;

  for (int i = 0; i < n2; i++)
    for (int j = 0; j <= n; j++)
      if (dp[i][j]) {
	if (j + 1 <= n) dp[i + 1][j + 1] += dp[i][j];
	if (j - 1 >= 0) dp[i + 1][j - 1] += dp[i][j];
      }

  printf("%d\n", dp[n2][0]);
  return 0;
}