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 r432348 = x;
        double r432349 = 1.0;
        double r432350 = r432348 + r432349;
        double r432351 = sqrt(r432350);
        double r432352 = sqrt(r432348);
        double r432353 = r432351 - r432352;
        double r432354 = y;
        double r432355 = r432354 + r432349;
        double r432356 = sqrt(r432355);
        double r432357 = sqrt(r432354);
        double r432358 = r432356 - r432357;
        double r432359 = r432353 + r432358;
        double r432360 = z;
        double r432361 = r432360 + r432349;
        double r432362 = sqrt(r432361);
        double r432363 = sqrt(r432360);
        double r432364 = r432362 - r432363;
        double r432365 = r432359 + r432364;
        double r432366 = t;
        double r432367 = r432366 + r432349;
        double r432368 = sqrt(r432367);
        double r432369 = sqrt(r432366);
        double r432370 = r432368 - r432369;
        double r432371 = r432365 + r432370;
        return r432371;
}