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 r522736 = x;
        double r522737 = 1.0;
        double r522738 = r522736 + r522737;
        double r522739 = sqrt(r522738);
        double r522740 = sqrt(r522736);
        double r522741 = r522739 - r522740;
        double r522742 = y;
        double r522743 = r522742 + r522737;
        double r522744 = sqrt(r522743);
        double r522745 = sqrt(r522742);
        double r522746 = r522744 - r522745;
        double r522747 = r522741 + r522746;
        double r522748 = z;
        double r522749 = r522748 + r522737;
        double r522750 = sqrt(r522749);
        double r522751 = sqrt(r522748);
        double r522752 = r522750 - r522751;
        double r522753 = r522747 + r522752;
        double r522754 = t;
        double r522755 = r522754 + r522737;
        double r522756 = sqrt(r522755);
        double r522757 = sqrt(r522754);
        double r522758 = r522756 - r522757;
        double r522759 = r522753 + r522758;
        return r522759;
}