double f(double a, double b, double c) {
double r4162720 = a;
double r4162721 = b;
double r4162722 = r4162720 + r4162721;
double r4162723 = c;
double r4162724 = r4162722 + r4162723;
double r4162725 = 2.0;
double r4162726 = r4162724 / r4162725;
double r4162727 = r4162726 - r4162720;
double r4162728 = r4162726 * r4162727;
double r4162729 = r4162726 - r4162721;
double r4162730 = r4162728 * r4162729;
double r4162731 = r4162726 - r4162723;
double r4162732 = r4162730 * r4162731;
double r4162733 = sqrt(r4162732);
return r4162733;
}