#include <bits/stdc++.h>

using namespace std;

long long sumOfGroup(int k) {
    if(k <= 0)
        return 0;
    long long rangm = (k + (long long)k*k);
    long long rang = ((k-1) + (long long)(k-1)*(k-1));
    
    return ((long long)(rangm)/2*(rangm)/2 - rang/2*rang/2);
}

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