Zadanie pętle 15

#include <iostream>
using namespace std;
int main()
{
    int x = 15, y = 0;
    int i;
    int z = x;
    int a = 0;

    for (i = 0; i < x; i++)
    {
        y = y + z;
        z--;
    }
    a = 2 * y;
    cout << "Ilosc cegiel w piramidzie wynosi: " << y << endl;
    cout << "Laczna waga wynosi: " << a <<" kg"<< endl;

}