Cannot sample enough valid points. (more)

\[\left(\left(\left(\sqrt{x + 1.0} - \sqrt{x}\right) + \left(\sqrt{y + 1.0} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1.0} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1.0} - \sqrt{t}\right)\]
\left(\left(\left(\sqrt{x + 1.0} - \sqrt{x}\right) + \left(\sqrt{y + 1.0} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1.0} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1.0} - \sqrt{t}\right)
double f(double x, double y, double z, double t) {
        double r24625387 = x;
        double r24625388 = 1.0;
        double r24625389 = r24625387 + r24625388;
        double r24625390 = sqrt(r24625389);
        double r24625391 = sqrt(r24625387);
        double r24625392 = r24625390 - r24625391;
        double r24625393 = y;
        double r24625394 = r24625393 + r24625388;
        double r24625395 = sqrt(r24625394);
        double r24625396 = sqrt(r24625393);
        double r24625397 = r24625395 - r24625396;
        double r24625398 = r24625392 + r24625397;
        double r24625399 = z;
        double r24625400 = r24625399 + r24625388;
        double r24625401 = sqrt(r24625400);
        double r24625402 = sqrt(r24625399);
        double r24625403 = r24625401 - r24625402;
        double r24625404 = r24625398 + r24625403;
        double r24625405 = t;
        double r24625406 = r24625405 + r24625388;
        double r24625407 = sqrt(r24625406);
        double r24625408 = sqrt(r24625405);
        double r24625409 = r24625407 - r24625408;
        double r24625410 = r24625404 + r24625409;
        return r24625410;
}