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

// Catalan numbers https://oeis.org/A000108
vector<long long> catalan = {
    1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012,
    742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190,
    6564120420, 24466267020, 91482563640, 343059613650, 1289904147324,
    4861946401452, 18367353072152, 69533550916004, 263747951750360,
    1002242216651368, 3814986502092304
};

int main()
{
    int N; cin >> N;
    cout << catalan[N] << endl;
}