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 r744299 = x;
        double r744300 = 1.0;
        double r744301 = r744299 + r744300;
        double r744302 = sqrt(r744301);
        double r744303 = sqrt(r744299);
        double r744304 = r744302 - r744303;
        double r744305 = y;
        double r744306 = r744305 + r744300;
        double r744307 = sqrt(r744306);
        double r744308 = sqrt(r744305);
        double r744309 = r744307 - r744308;
        double r744310 = r744304 + r744309;
        double r744311 = z;
        double r744312 = r744311 + r744300;
        double r744313 = sqrt(r744312);
        double r744314 = sqrt(r744311);
        double r744315 = r744313 - r744314;
        double r744316 = r744310 + r744315;
        double r744317 = t;
        double r744318 = r744317 + r744300;
        double r744319 = sqrt(r744318);
        double r744320 = sqrt(r744317);
        double r744321 = r744319 - r744320;
        double r744322 = r744316 + r744321;
        return r744322;
}