#include <bits/stdc++.h> 
using namespace std;

#ifdef LOCAL
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
#define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
  dp[i][j]
    i文字目まででj個(をつかっている
*/

ll dp[30][15];

int main()
{
  int n;
  cin >> n;

  dp[0][0] = 1;
  rep(i, n*2){
    rep(j, n+1){
      dp[i+1][j+1] += dp[i][j];
      if(j > i-j) dp[i+1][j] += dp[i][j];
    }
  }

  cout << dp[2*n][n] << endl;

/*
  rep(i, 2*n+1){
    rep(j, n+1){
      cout << dp[i][j] << " ";
    }
    cout << endl;
  }
*/

  return 0;
}