// 129
#include <bits/stdc++.h>
using namespace std;
int ans[19] = {0, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700};
int main()
{
    int n;
    cin >> n;
    cout << ans[n];
    return 0;
}