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 r341224 = x;
        double r341225 = 1.0;
        double r341226 = r341224 + r341225;
        double r341227 = sqrt(r341226);
        double r341228 = sqrt(r341224);
        double r341229 = r341227 - r341228;
        double r341230 = y;
        double r341231 = r341230 + r341225;
        double r341232 = sqrt(r341231);
        double r341233 = sqrt(r341230);
        double r341234 = r341232 - r341233;
        double r341235 = r341229 + r341234;
        double r341236 = z;
        double r341237 = r341236 + r341225;
        double r341238 = sqrt(r341237);
        double r341239 = sqrt(r341236);
        double r341240 = r341238 - r341239;
        double r341241 = r341235 + r341240;
        double r341242 = t;
        double r341243 = r341242 + r341225;
        double r341244 = sqrt(r341243);
        double r341245 = sqrt(r341242);
        double r341246 = r341244 - r341245;
        double r341247 = r341241 + r341246;
        return r341247;
}