double f(double a, double b, double c) {
double r1664396 = a;
double r1664397 = b;
double r1664398 = r1664396 + r1664397;
double r1664399 = c;
double r1664400 = r1664398 + r1664399;
double r1664401 = 2.0;
double r1664402 = r1664400 / r1664401;
double r1664403 = r1664402 - r1664396;
double r1664404 = r1664402 * r1664403;
double r1664405 = r1664402 - r1664397;
double r1664406 = r1664404 * r1664405;
double r1664407 = r1664402 - r1664399;
double r1664408 = r1664406 * r1664407;
double r1664409 = sqrt(r1664408);
return r1664409;
}