double f(double a, double b, double c) {
double r1577131 = a;
double r1577132 = b;
double r1577133 = r1577131 + r1577132;
double r1577134 = c;
double r1577135 = r1577133 + r1577134;
double r1577136 = 2.0;
double r1577137 = r1577135 / r1577136;
double r1577138 = r1577137 - r1577131;
double r1577139 = r1577137 * r1577138;
double r1577140 = r1577137 - r1577132;
double r1577141 = r1577139 * r1577140;
double r1577142 = r1577137 - r1577134;
double r1577143 = r1577141 * r1577142;
double r1577144 = sqrt(r1577143);
return r1577144;
}