double f(double a, double b, double c) {
double r1128419 = a;
double r1128420 = b;
double r1128421 = r1128419 + r1128420;
double r1128422 = c;
double r1128423 = r1128421 + r1128422;
double r1128424 = 2.0;
double r1128425 = r1128423 / r1128424;
double r1128426 = r1128425 - r1128419;
double r1128427 = r1128425 * r1128426;
double r1128428 = r1128425 - r1128420;
double r1128429 = r1128427 * r1128428;
double r1128430 = r1128425 - r1128422;
double r1128431 = r1128429 * r1128430;
double r1128432 = sqrt(r1128431);
return r1128432;
}