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 r296851 = x;
        double r296852 = 1.0;
        double r296853 = r296851 + r296852;
        double r296854 = sqrt(r296853);
        double r296855 = sqrt(r296851);
        double r296856 = r296854 - r296855;
        double r296857 = y;
        double r296858 = r296857 + r296852;
        double r296859 = sqrt(r296858);
        double r296860 = sqrt(r296857);
        double r296861 = r296859 - r296860;
        double r296862 = r296856 + r296861;
        double r296863 = z;
        double r296864 = r296863 + r296852;
        double r296865 = sqrt(r296864);
        double r296866 = sqrt(r296863);
        double r296867 = r296865 - r296866;
        double r296868 = r296862 + r296867;
        double r296869 = t;
        double r296870 = r296869 + r296852;
        double r296871 = sqrt(r296870);
        double r296872 = sqrt(r296869);
        double r296873 = r296871 - r296872;
        double r296874 = r296868 + r296873;
        return r296874;
}