double f(double a, double b, double c) {
double r1179281 = a;
double r1179282 = b;
double r1179283 = r1179281 + r1179282;
double r1179284 = c;
double r1179285 = r1179283 + r1179284;
double r1179286 = 2.0;
double r1179287 = r1179285 / r1179286;
double r1179288 = r1179287 - r1179281;
double r1179289 = r1179287 * r1179288;
double r1179290 = r1179287 - r1179282;
double r1179291 = r1179289 * r1179290;
double r1179292 = r1179287 - r1179284;
double r1179293 = r1179291 * r1179292;
double r1179294 = sqrt(r1179293);
return r1179294;
}