gistfile1.cpp

#include <iostream>

int main()
{
    int x = 1;
    int result = 0; 
    int n;
    
    std::cout << "N = ";
    std::cin >> n;

    for (int i = 1; i < n; ++i) {
        result += i * i + 1;
    }

    std::cout << "Result is " << result << std::endl;
    return 0;
}