#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int a[N][N];

void solve()
{
    int n;
    cin >> n;
    for(int i = 0; i < n; ++ i)
    {
        for(int j = 0; j < n; ++ j)
        {
            a[i][j] = i * n + j + 1;
        }
    }
    int res = 0;
    for(int i = 0; i < n; ++ i)
    {
        res += a[i][i];
        res += a[i][(i + 1) % n];
    }
    cout << res << '\n';
}
int main()
{
    int t = 1;
    while(t --) solve();
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
void solve()
{
    int n;
    cin >> n;
    cout << n * n * n + n << '\n';
}
int main()
{
    int t = 1;
    while(t --) solve();
    return 0;
}