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 r292044 = x;
        double r292045 = 1.0;
        double r292046 = r292044 + r292045;
        double r292047 = sqrt(r292046);
        double r292048 = sqrt(r292044);
        double r292049 = r292047 - r292048;
        double r292050 = y;
        double r292051 = r292050 + r292045;
        double r292052 = sqrt(r292051);
        double r292053 = sqrt(r292050);
        double r292054 = r292052 - r292053;
        double r292055 = r292049 + r292054;
        double r292056 = z;
        double r292057 = r292056 + r292045;
        double r292058 = sqrt(r292057);
        double r292059 = sqrt(r292056);
        double r292060 = r292058 - r292059;
        double r292061 = r292055 + r292060;
        double r292062 = t;
        double r292063 = r292062 + r292045;
        double r292064 = sqrt(r292063);
        double r292065 = sqrt(r292062);
        double r292066 = r292064 - r292065;
        double r292067 = r292061 + r292066;
        return r292067;
}