long producedureDirectPi(int N)
{
    long nHits = 0;
    long x = 0;
    long y = 0;
    for(i = 0, i < N, i++)
    {
        x = metodoRan (1, -1);
        y = metodoRan (1, -1);
        if ( (x*x) + (y*y) ) < 1)
            {
                nHits = nHits++;
            }
    }
    return nHits;
}