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 r484532 = x;
        double r484533 = 1.0;
        double r484534 = r484532 + r484533;
        double r484535 = sqrt(r484534);
        double r484536 = sqrt(r484532);
        double r484537 = r484535 - r484536;
        double r484538 = y;
        double r484539 = r484538 + r484533;
        double r484540 = sqrt(r484539);
        double r484541 = sqrt(r484538);
        double r484542 = r484540 - r484541;
        double r484543 = r484537 + r484542;
        double r484544 = z;
        double r484545 = r484544 + r484533;
        double r484546 = sqrt(r484545);
        double r484547 = sqrt(r484544);
        double r484548 = r484546 - r484547;
        double r484549 = r484543 + r484548;
        double r484550 = t;
        double r484551 = r484550 + r484533;
        double r484552 = sqrt(r484551);
        double r484553 = sqrt(r484550);
        double r484554 = r484552 - r484553;
        double r484555 = r484549 + r484554;
        return r484555;
}