#include <bits/stdc++.h>

using namespace std;

unsigned long sumOfGroup(int k) {
    // Return the sum of the elements of the k'th group.

    unsigned long k1 = static_cast<unsigned long>(k);

    return (k1*k1*k1);

    long s = 0;
    long t = 0;

    s = k*(k-1)+1;
    t = k*s + k*(k-1);
    return t;
}

int main() {
    int k;
    cin >> k;
    unsigned long answer = sumOfGroup(k);
    cout << answer << endl;
    return 0;
}