double f(double a, double b, double c) {
double r1166883 = a;
double r1166884 = b;
double r1166885 = r1166883 + r1166884;
double r1166886 = c;
double r1166887 = r1166885 + r1166886;
double r1166888 = 2.0;
double r1166889 = r1166887 / r1166888;
double r1166890 = r1166889 - r1166883;
double r1166891 = r1166889 * r1166890;
double r1166892 = r1166889 - r1166884;
double r1166893 = r1166891 * r1166892;
double r1166894 = r1166889 - r1166886;
double r1166895 = r1166893 * r1166894;
double r1166896 = sqrt(r1166895);
return r1166896;
}