double f(double a, double b, double c) {
double r1270812 = a;
double r1270813 = b;
double r1270814 = r1270812 + r1270813;
double r1270815 = c;
double r1270816 = r1270814 + r1270815;
double r1270817 = 2.0;
double r1270818 = r1270816 / r1270817;
double r1270819 = r1270818 - r1270812;
double r1270820 = r1270818 * r1270819;
double r1270821 = r1270818 - r1270813;
double r1270822 = r1270820 * r1270821;
double r1270823 = r1270818 - r1270815;
double r1270824 = r1270822 * r1270823;
double r1270825 = sqrt(r1270824);
return r1270825;
}