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 r369772 = x;
        double r369773 = 1.0;
        double r369774 = r369772 + r369773;
        double r369775 = sqrt(r369774);
        double r369776 = sqrt(r369772);
        double r369777 = r369775 - r369776;
        double r369778 = y;
        double r369779 = r369778 + r369773;
        double r369780 = sqrt(r369779);
        double r369781 = sqrt(r369778);
        double r369782 = r369780 - r369781;
        double r369783 = r369777 + r369782;
        double r369784 = z;
        double r369785 = r369784 + r369773;
        double r369786 = sqrt(r369785);
        double r369787 = sqrt(r369784);
        double r369788 = r369786 - r369787;
        double r369789 = r369783 + r369788;
        double r369790 = t;
        double r369791 = r369790 + r369773;
        double r369792 = sqrt(r369791);
        double r369793 = sqrt(r369790);
        double r369794 = r369792 - r369793;
        double r369795 = r369789 + r369794;
        return r369795;
}