double f(double a, double b, double c) {
double r10923981 = a;
double r10923982 = b;
double r10923983 = r10923981 + r10923982;
double r10923984 = c;
double r10923985 = r10923983 + r10923984;
double r10923986 = 2.0;
double r10923987 = r10923985 / r10923986;
double r10923988 = r10923987 - r10923981;
double r10923989 = r10923987 * r10923988;
double r10923990 = r10923987 - r10923982;
double r10923991 = r10923989 * r10923990;
double r10923992 = r10923987 - r10923984;
double r10923993 = r10923991 * r10923992;
double r10923994 = sqrt(r10923993);
return r10923994;
}