double f(double a, double b, double c) {
double r1270880 = a;
double r1270881 = b;
double r1270882 = r1270880 + r1270881;
double r1270883 = c;
double r1270884 = r1270882 + r1270883;
double r1270885 = 2.0;
double r1270886 = r1270884 / r1270885;
double r1270887 = r1270886 - r1270880;
double r1270888 = r1270886 * r1270887;
double r1270889 = r1270886 - r1270881;
double r1270890 = r1270888 * r1270889;
double r1270891 = r1270886 - r1270883;
double r1270892 = r1270890 * r1270891;
double r1270893 = sqrt(r1270892);
return r1270893;
}