double f(double a, double b, double c) {
double r3951878 = a;
double r3951879 = b;
double r3951880 = r3951878 + r3951879;
double r3951881 = c;
double r3951882 = r3951880 + r3951881;
double r3951883 = 2.0;
double r3951884 = r3951882 / r3951883;
double r3951885 = r3951884 - r3951878;
double r3951886 = r3951884 * r3951885;
double r3951887 = r3951884 - r3951879;
double r3951888 = r3951886 * r3951887;
double r3951889 = r3951884 - r3951881;
double r3951890 = r3951888 * r3951889;
double r3951891 = sqrt(r3951890);
return r3951891;
}