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 r298052 = x;
        double r298053 = 1.0;
        double r298054 = r298052 + r298053;
        double r298055 = sqrt(r298054);
        double r298056 = sqrt(r298052);
        double r298057 = r298055 - r298056;
        double r298058 = y;
        double r298059 = r298058 + r298053;
        double r298060 = sqrt(r298059);
        double r298061 = sqrt(r298058);
        double r298062 = r298060 - r298061;
        double r298063 = r298057 + r298062;
        double r298064 = z;
        double r298065 = r298064 + r298053;
        double r298066 = sqrt(r298065);
        double r298067 = sqrt(r298064);
        double r298068 = r298066 - r298067;
        double r298069 = r298063 + r298068;
        double r298070 = t;
        double r298071 = r298070 + r298053;
        double r298072 = sqrt(r298071);
        double r298073 = sqrt(r298070);
        double r298074 = r298072 - r298073;
        double r298075 = r298069 + r298074;
        return r298075;
}