double f(double a, double b, double c) {
double r2748329 = a;
double r2748330 = b;
double r2748331 = r2748329 + r2748330;
double r2748332 = c;
double r2748333 = r2748331 + r2748332;
double r2748334 = 2.0;
double r2748335 = r2748333 / r2748334;
double r2748336 = r2748335 - r2748329;
double r2748337 = r2748335 * r2748336;
double r2748338 = r2748335 - r2748330;
double r2748339 = r2748337 * r2748338;
double r2748340 = r2748335 - r2748332;
double r2748341 = r2748339 * r2748340;
double r2748342 = sqrt(r2748341);
return r2748342;
}