double f(double a, double b, double c) {
double r2894890 = a;
double r2894891 = b;
double r2894892 = r2894890 + r2894891;
double r2894893 = c;
double r2894894 = r2894892 + r2894893;
double r2894895 = 2.0;
double r2894896 = r2894894 / r2894895;
double r2894897 = r2894896 - r2894890;
double r2894898 = r2894896 * r2894897;
double r2894899 = r2894896 - r2894891;
double r2894900 = r2894898 * r2894899;
double r2894901 = r2894896 - r2894893;
double r2894902 = r2894900 * r2894901;
double r2894903 = sqrt(r2894902);
return r2894903;
}