double f(double a, double b, double c) {
double r7156298 = a;
double r7156299 = b;
double r7156300 = r7156298 + r7156299;
double r7156301 = c;
double r7156302 = r7156300 + r7156301;
double r7156303 = 2.0;
double r7156304 = r7156302 / r7156303;
double r7156305 = r7156304 - r7156298;
double r7156306 = r7156304 * r7156305;
double r7156307 = r7156304 - r7156299;
double r7156308 = r7156306 * r7156307;
double r7156309 = r7156304 - r7156301;
double r7156310 = r7156308 * r7156309;
double r7156311 = sqrt(r7156310);
return r7156311;
}