double f(double a, double b, double c) {
double r5431906 = a;
double r5431907 = b;
double r5431908 = r5431906 + r5431907;
double r5431909 = c;
double r5431910 = r5431908 + r5431909;
double r5431911 = 2.0;
double r5431912 = r5431910 / r5431911;
double r5431913 = r5431912 - r5431906;
double r5431914 = r5431912 * r5431913;
double r5431915 = r5431912 - r5431907;
double r5431916 = r5431914 * r5431915;
double r5431917 = r5431912 - r5431909;
double r5431918 = r5431916 * r5431917;
double r5431919 = sqrt(r5431918);
return r5431919;
}