#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
using namespace std;
using ll = long long;

bool isOK(string s){
    bool ret = true;
    int cnt = 0;
    rep(i, s.size()){
        if(s[i] == '(') cnt++;
        else cnt--;
        if(cnt < 0) ret = false;
    }
    if(cnt != 0) ret = false;

    return ret;
}

int main(){
    int n;
    cin >> n;

    ll ans = 0;

    for(int bit = 0; bit < (1<<(2*n)); bit++){
        string s = "";
        int cnt = 0;
        for(int i=0; i<2*n; i++){
            if(bit & (1<<i)) s += "(";
            else{
                s += ")";
                cnt++;
            }
        }
        if(cnt != n) continue;
        ans += isOK(s);
    }

    cout << ans << endl;

    return 0;
}