#include <bits/stdc++.h>

using namespace std;
int n;
int hihihoho(){
    int idx = n-1;
    int lmao = 0;
    int bada = 0;
    vector <int> dp;
    for(int i = 1; i <= n; i++){
        dp.push_back(i);
    }
    for(int i = 0; i < n-1; i++){
        for(int j = lmao; j!= idx; j++){
            dp.push_back(dp[j]+dp[j+1]);
        }
    lmao = idx - bada + 1;
    idx = dp.size()-1;
    }
    return dp[dp.size()-1];
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    cout << hihihoho();
    return 0;
}