double f(double a, double b, double c) {
double r5479405 = a;
double r5479406 = b;
double r5479407 = r5479405 + r5479406;
double r5479408 = c;
double r5479409 = r5479407 + r5479408;
double r5479410 = 2.0;
double r5479411 = r5479409 / r5479410;
double r5479412 = r5479411 - r5479405;
double r5479413 = r5479411 * r5479412;
double r5479414 = r5479411 - r5479406;
double r5479415 = r5479413 * r5479414;
double r5479416 = r5479411 - r5479408;
double r5479417 = r5479415 * r5479416;
double r5479418 = sqrt(r5479417);
return r5479418;
}