#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <deque>
using namespace std;

namespace dts
{
typedef long long ll;

ll n;

void main()
{
scanf("%lld",&n);
printf("%lld\n",n*(n+1)*(2*n+1)/6);
}
};

int main()
{
dts::main();
}