Cannot sample enough valid points. (more)

\[0.0 \lt a \land 0.0 \lt b \land 0.0 \lt c\]
\[\sqrt{\left(\left(\frac{\left(a + b\right) + c}{2} \cdot \left(\frac{\left(a + b\right) + c}{2} - a\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - b\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - c\right)}\]
\sqrt{\left(\left(\frac{\left(a + b\right) + c}{2} \cdot \left(\frac{\left(a + b\right) + c}{2} - a\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - b\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - c\right)}
double f(double a, double b, double c) {
        double r20637 = a;
        double r20638 = b;
        double r20639 = r20637 + r20638;
        double r20640 = c;
        double r20641 = r20639 + r20640;
        double r20642 = 2.0;
        double r20643 = r20641 / r20642;
        double r20644 = r20643 - r20637;
        double r20645 = r20643 * r20644;
        double r20646 = r20643 - r20638;
        double r20647 = r20645 * r20646;
        double r20648 = r20643 - r20640;
        double r20649 = r20647 * r20648;
        double r20650 = sqrt(r20649);
        return r20650;
}