double f(double a, double b, double c) {
double r5731085 = a;
double r5731086 = b;
double r5731087 = r5731085 + r5731086;
double r5731088 = c;
double r5731089 = r5731087 + r5731088;
double r5731090 = 2.0;
double r5731091 = r5731089 / r5731090;
double r5731092 = r5731091 - r5731085;
double r5731093 = r5731091 * r5731092;
double r5731094 = r5731091 - r5731086;
double r5731095 = r5731093 * r5731094;
double r5731096 = r5731091 - r5731088;
double r5731097 = r5731095 * r5731096;
double r5731098 = sqrt(r5731097);
return r5731098;
}