#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

vector<long long> getcatalan(int n) {
  vector<long long> c(n+1, 1);
  for (int i = 2; i <= n; i++) {
    c[i] = 0;
    for (int j = 0; j < i; j++)
      c[i] += c[j] * c[i-1-j];
  }
  return c;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<long long> c = getcatalan(n);
  cout << c[n] << endl;
  return 0;
}