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 r296844 = x;
        double r296845 = 1.0;
        double r296846 = r296844 + r296845;
        double r296847 = sqrt(r296846);
        double r296848 = sqrt(r296844);
        double r296849 = r296847 - r296848;
        double r296850 = y;
        double r296851 = r296850 + r296845;
        double r296852 = sqrt(r296851);
        double r296853 = sqrt(r296850);
        double r296854 = r296852 - r296853;
        double r296855 = r296849 + r296854;
        double r296856 = z;
        double r296857 = r296856 + r296845;
        double r296858 = sqrt(r296857);
        double r296859 = sqrt(r296856);
        double r296860 = r296858 - r296859;
        double r296861 = r296855 + r296860;
        double r296862 = t;
        double r296863 = r296862 + r296845;
        double r296864 = sqrt(r296863);
        double r296865 = sqrt(r296862);
        double r296866 = r296864 - r296865;
        double r296867 = r296861 + r296866;
        return r296867;
}