#include<bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
int n;
while(cin >>n && n){
int total = 0;
for (int i = 2; i <= n; ++i)
{
total+=(i*i);
}
cout << total+1 << '\n';
}
return 0;
}
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
int n;
while(cin >>n && n){
int total = 0;
for (int i = 2; i <= n; ++i)
{
total+=(i*i);
}
cout << total+1 << '\n';
}
return 0;
}
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