double f(double a, double b, double c) {
double r21524256 = a;
double r21524257 = b;
double r21524258 = r21524256 + r21524257;
double r21524259 = c;
double r21524260 = r21524258 + r21524259;
double r21524261 = 2.0;
double r21524262 = r21524260 / r21524261;
double r21524263 = r21524262 - r21524256;
double r21524264 = r21524262 * r21524263;
double r21524265 = r21524262 - r21524257;
double r21524266 = r21524264 * r21524265;
double r21524267 = r21524262 - r21524259;
double r21524268 = r21524266 * r21524267;
double r21524269 = sqrt(r21524268);
return r21524269;
}