double f(double a, double b, double c) {
double r4055393 = a;
double r4055394 = b;
double r4055395 = r4055393 + r4055394;
double r4055396 = c;
double r4055397 = r4055395 + r4055396;
double r4055398 = 2.0;
double r4055399 = r4055397 / r4055398;
double r4055400 = r4055399 - r4055393;
double r4055401 = r4055399 * r4055400;
double r4055402 = r4055399 - r4055394;
double r4055403 = r4055401 * r4055402;
double r4055404 = r4055399 - r4055396;
double r4055405 = r4055403 * r4055404;
double r4055406 = sqrt(r4055405);
return r4055406;
}