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 r445200 = x;
        double r445201 = 1.0;
        double r445202 = r445200 + r445201;
        double r445203 = sqrt(r445202);
        double r445204 = sqrt(r445200);
        double r445205 = r445203 - r445204;
        double r445206 = y;
        double r445207 = r445206 + r445201;
        double r445208 = sqrt(r445207);
        double r445209 = sqrt(r445206);
        double r445210 = r445208 - r445209;
        double r445211 = r445205 + r445210;
        double r445212 = z;
        double r445213 = r445212 + r445201;
        double r445214 = sqrt(r445213);
        double r445215 = sqrt(r445212);
        double r445216 = r445214 - r445215;
        double r445217 = r445211 + r445216;
        double r445218 = t;
        double r445219 = r445218 + r445201;
        double r445220 = sqrt(r445219);
        double r445221 = sqrt(r445218);
        double r445222 = r445220 - r445221;
        double r445223 = r445217 + r445222;
        return r445223;
}