double f(double a, double b, double c) {
double r3691470 = a;
double r3691471 = b;
double r3691472 = r3691470 + r3691471;
double r3691473 = c;
double r3691474 = r3691472 + r3691473;
double r3691475 = 2.0;
double r3691476 = r3691474 / r3691475;
double r3691477 = r3691476 - r3691470;
double r3691478 = r3691476 * r3691477;
double r3691479 = r3691476 - r3691471;
double r3691480 = r3691478 * r3691479;
double r3691481 = r3691476 - r3691473;
double r3691482 = r3691480 * r3691481;
double r3691483 = sqrt(r3691482);
return r3691483;
}