//かたらんすう〜〜
#include <bits/stdc++.h>
using namespace std;
int a[] = {1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845};

int main(){
    int n; cin >> n; cout << a[n] << endl;
    return 0;
}