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 r500044 = x;
        double r500045 = 1.0;
        double r500046 = r500044 + r500045;
        double r500047 = sqrt(r500046);
        double r500048 = sqrt(r500044);
        double r500049 = r500047 - r500048;
        double r500050 = y;
        double r500051 = r500050 + r500045;
        double r500052 = sqrt(r500051);
        double r500053 = sqrt(r500050);
        double r500054 = r500052 - r500053;
        double r500055 = r500049 + r500054;
        double r500056 = z;
        double r500057 = r500056 + r500045;
        double r500058 = sqrt(r500057);
        double r500059 = sqrt(r500056);
        double r500060 = r500058 - r500059;
        double r500061 = r500055 + r500060;
        double r500062 = t;
        double r500063 = r500062 + r500045;
        double r500064 = sqrt(r500063);
        double r500065 = sqrt(r500062);
        double r500066 = r500064 - r500065;
        double r500067 = r500061 + r500066;
        return r500067;
}