Точки домино

#include <iostream>
#include <conio.h>
#include <math.h>
#include <string>
#include <algorithm>
#include <set>

using namespace ::std;

int main()
{
    long long intellect, sum;

    cin >> intellect;
    if (intellect % 2 == 0)
        sum = (intellect + 1)*(intellect / 2);
    else
        sum = ((intellect + 1)*(intellect / 2) + intellect / 2 + 1);
    sum = sum*(intellect + 2);

    cout << sum;

    _getch();
    return 0;
}