double f(double a, double b, double c) {
double r2810721 = a;
double r2810722 = b;
double r2810723 = r2810721 + r2810722;
double r2810724 = c;
double r2810725 = r2810723 + r2810724;
double r2810726 = 2.0;
double r2810727 = r2810725 / r2810726;
double r2810728 = r2810727 - r2810721;
double r2810729 = r2810727 * r2810728;
double r2810730 = r2810727 - r2810722;
double r2810731 = r2810729 * r2810730;
double r2810732 = r2810727 - r2810724;
double r2810733 = r2810731 * r2810732;
double r2810734 = sqrt(r2810733);
return r2810734;
}