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 r560162 = x;
        double r560163 = 1.0;
        double r560164 = r560162 + r560163;
        double r560165 = sqrt(r560164);
        double r560166 = sqrt(r560162);
        double r560167 = r560165 - r560166;
        double r560168 = y;
        double r560169 = r560168 + r560163;
        double r560170 = sqrt(r560169);
        double r560171 = sqrt(r560168);
        double r560172 = r560170 - r560171;
        double r560173 = r560167 + r560172;
        double r560174 = z;
        double r560175 = r560174 + r560163;
        double r560176 = sqrt(r560175);
        double r560177 = sqrt(r560174);
        double r560178 = r560176 - r560177;
        double r560179 = r560173 + r560178;
        double r560180 = t;
        double r560181 = r560180 + r560163;
        double r560182 = sqrt(r560181);
        double r560183 = sqrt(r560180);
        double r560184 = r560182 - r560183;
        double r560185 = r560179 + r560184;
        return r560185;
}