double f(double a, double b, double c) {
double r1241855 = a;
double r1241856 = b;
double r1241857 = r1241855 + r1241856;
double r1241858 = c;
double r1241859 = r1241857 + r1241858;
double r1241860 = 2.0;
double r1241861 = r1241859 / r1241860;
double r1241862 = r1241861 - r1241855;
double r1241863 = r1241861 * r1241862;
double r1241864 = r1241861 - r1241856;
double r1241865 = r1241863 * r1241864;
double r1241866 = r1241861 - r1241858;
double r1241867 = r1241865 * r1241866;
double r1241868 = sqrt(r1241867);
return r1241868;
}