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 r574057 = x;
        double r574058 = 1.0;
        double r574059 = r574057 + r574058;
        double r574060 = sqrt(r574059);
        double r574061 = sqrt(r574057);
        double r574062 = r574060 - r574061;
        double r574063 = y;
        double r574064 = r574063 + r574058;
        double r574065 = sqrt(r574064);
        double r574066 = sqrt(r574063);
        double r574067 = r574065 - r574066;
        double r574068 = r574062 + r574067;
        double r574069 = z;
        double r574070 = r574069 + r574058;
        double r574071 = sqrt(r574070);
        double r574072 = sqrt(r574069);
        double r574073 = r574071 - r574072;
        double r574074 = r574068 + r574073;
        double r574075 = t;
        double r574076 = r574075 + r574058;
        double r574077 = sqrt(r574076);
        double r574078 = sqrt(r574075);
        double r574079 = r574077 - r574078;
        double r574080 = r574074 + r574079;
        return r574080;
}