Cannot sample enough valid points. (more)

\[\left(\left(\left(\sqrt{x + 1} - \sqrt{x}\right) + \left(\sqrt{y + 1} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1} - \sqrt{t}\right)\]
\left(\left(\left(\sqrt{x + 1} - \sqrt{x}\right) + \left(\sqrt{y + 1} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1} - \sqrt{t}\right)
double f(double x, double y, double z, double t) {
        double r349544 = x;
        double r349545 = 1.0;
        double r349546 = r349544 + r349545;
        double r349547 = sqrt(r349546);
        double r349548 = sqrt(r349544);
        double r349549 = r349547 - r349548;
        double r349550 = y;
        double r349551 = r349550 + r349545;
        double r349552 = sqrt(r349551);
        double r349553 = sqrt(r349550);
        double r349554 = r349552 - r349553;
        double r349555 = r349549 + r349554;
        double r349556 = z;
        double r349557 = r349556 + r349545;
        double r349558 = sqrt(r349557);
        double r349559 = sqrt(r349556);
        double r349560 = r349558 - r349559;
        double r349561 = r349555 + r349560;
        double r349562 = t;
        double r349563 = r349562 + r349545;
        double r349564 = sqrt(r349563);
        double r349565 = sqrt(r349562);
        double r349566 = r349564 - r349565;
        double r349567 = r349561 + r349566;
        return r349567;
}