Cannot sample enough valid points. (more)

\[\left(\left(\left(\sqrt{x + 1.0} - \sqrt{x}\right) + \left(\sqrt{y + 1.0} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1.0} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1.0} - \sqrt{t}\right)\]
\left(\left(\left(\sqrt{x + 1.0} - \sqrt{x}\right) + \left(\sqrt{y + 1.0} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1.0} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1.0} - \sqrt{t}\right)
double f(double x, double y, double z, double t) {
        double r22925634 = x;
        double r22925635 = 1.0;
        double r22925636 = r22925634 + r22925635;
        double r22925637 = sqrt(r22925636);
        double r22925638 = sqrt(r22925634);
        double r22925639 = r22925637 - r22925638;
        double r22925640 = y;
        double r22925641 = r22925640 + r22925635;
        double r22925642 = sqrt(r22925641);
        double r22925643 = sqrt(r22925640);
        double r22925644 = r22925642 - r22925643;
        double r22925645 = r22925639 + r22925644;
        double r22925646 = z;
        double r22925647 = r22925646 + r22925635;
        double r22925648 = sqrt(r22925647);
        double r22925649 = sqrt(r22925646);
        double r22925650 = r22925648 - r22925649;
        double r22925651 = r22925645 + r22925650;
        double r22925652 = t;
        double r22925653 = r22925652 + r22925635;
        double r22925654 = sqrt(r22925653);
        double r22925655 = sqrt(r22925652);
        double r22925656 = r22925654 - r22925655;
        double r22925657 = r22925651 + r22925656;
        return r22925657;
}