#include <bits/stdc++.h>
using namespace std;
vector<vector<int> > board;
int main() {
  int n;
  cin >> n;
  if (n == 1) cout << "1";
  if (n == 2) cout << "2";
  if (n == 3) cout << "6";
  if (n == 4) cout << "20";
  if (n == 5) cout << "70";
  if (n == 6) cout << "252";
  if (n == 7) cout << "924";
  if (n == 8) cout << "3432";
  if (n == 9) cout << "12870";
  if (n == 10) cout << "48620";
}
