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 r434029 = x;
        double r434030 = 1.0;
        double r434031 = r434029 + r434030;
        double r434032 = sqrt(r434031);
        double r434033 = sqrt(r434029);
        double r434034 = r434032 - r434033;
        double r434035 = y;
        double r434036 = r434035 + r434030;
        double r434037 = sqrt(r434036);
        double r434038 = sqrt(r434035);
        double r434039 = r434037 - r434038;
        double r434040 = r434034 + r434039;
        double r434041 = z;
        double r434042 = r434041 + r434030;
        double r434043 = sqrt(r434042);
        double r434044 = sqrt(r434041);
        double r434045 = r434043 - r434044;
        double r434046 = r434040 + r434045;
        double r434047 = t;
        double r434048 = r434047 + r434030;
        double r434049 = sqrt(r434048);
        double r434050 = sqrt(r434047);
        double r434051 = r434049 - r434050;
        double r434052 = r434046 + r434051;
        return r434052;
}