double f(double a, double b, double c) {
double r1387477 = a;
double r1387478 = b;
double r1387479 = r1387477 + r1387478;
double r1387480 = c;
double r1387481 = r1387479 + r1387480;
double r1387482 = 2.0;
double r1387483 = r1387481 / r1387482;
double r1387484 = r1387483 - r1387477;
double r1387485 = r1387483 * r1387484;
double r1387486 = r1387483 - r1387478;
double r1387487 = r1387485 * r1387486;
double r1387488 = r1387483 - r1387480;
double r1387489 = r1387487 * r1387488;
double r1387490 = sqrt(r1387489);
return r1387490;
}