double f(double a, double b, double c) {
double r1947155 = a;
double r1947156 = b;
double r1947157 = r1947155 + r1947156;
double r1947158 = c;
double r1947159 = r1947157 + r1947158;
double r1947160 = 2.0;
double r1947161 = r1947159 / r1947160;
double r1947162 = r1947161 - r1947155;
double r1947163 = r1947161 * r1947162;
double r1947164 = r1947161 - r1947156;
double r1947165 = r1947163 * r1947164;
double r1947166 = r1947161 - r1947158;
double r1947167 = r1947165 * r1947166;
double r1947168 = sqrt(r1947167);
return r1947168;
}