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 r1017473 = x;
        double r1017474 = 1.0;
        double r1017475 = r1017473 + r1017474;
        double r1017476 = sqrt(r1017475);
        double r1017477 = sqrt(r1017473);
        double r1017478 = r1017476 - r1017477;
        double r1017479 = y;
        double r1017480 = r1017479 + r1017474;
        double r1017481 = sqrt(r1017480);
        double r1017482 = sqrt(r1017479);
        double r1017483 = r1017481 - r1017482;
        double r1017484 = r1017478 + r1017483;
        double r1017485 = z;
        double r1017486 = r1017485 + r1017474;
        double r1017487 = sqrt(r1017486);
        double r1017488 = sqrt(r1017485);
        double r1017489 = r1017487 - r1017488;
        double r1017490 = r1017484 + r1017489;
        double r1017491 = t;
        double r1017492 = r1017491 + r1017474;
        double r1017493 = sqrt(r1017492);
        double r1017494 = sqrt(r1017491);
        double r1017495 = r1017493 - r1017494;
        double r1017496 = r1017490 + r1017495;
        return r1017496;
}