double f(double a, double b, double c) {
double r1693285 = a;
double r1693286 = b;
double r1693287 = r1693285 + r1693286;
double r1693288 = c;
double r1693289 = r1693287 + r1693288;
double r1693290 = 2.0;
double r1693291 = r1693289 / r1693290;
double r1693292 = r1693291 - r1693285;
double r1693293 = r1693291 * r1693292;
double r1693294 = r1693291 - r1693286;
double r1693295 = r1693293 * r1693294;
double r1693296 = r1693291 - r1693288;
double r1693297 = r1693295 * r1693296;
double r1693298 = sqrt(r1693297);
return r1693298;
}