double f(double a, double b, double c) {
double r16958683 = a;
double r16958684 = b;
double r16958685 = r16958683 + r16958684;
double r16958686 = c;
double r16958687 = r16958685 + r16958686;
double r16958688 = 2.0;
double r16958689 = r16958687 / r16958688;
double r16958690 = r16958689 - r16958683;
double r16958691 = r16958689 * r16958690;
double r16958692 = r16958689 - r16958684;
double r16958693 = r16958691 * r16958692;
double r16958694 = r16958689 - r16958686;
double r16958695 = r16958693 * r16958694;
double r16958696 = sqrt(r16958695);
return r16958696;
}