double f(double a, double b, double c) {
double r1039800 = a;
double r1039801 = b;
double r1039802 = r1039800 + r1039801;
double r1039803 = c;
double r1039804 = r1039802 + r1039803;
double r1039805 = 2.0;
double r1039806 = r1039804 / r1039805;
double r1039807 = r1039806 - r1039800;
double r1039808 = r1039806 * r1039807;
double r1039809 = r1039806 - r1039801;
double r1039810 = r1039808 * r1039809;
double r1039811 = r1039806 - r1039803;
double r1039812 = r1039810 * r1039811;
double r1039813 = sqrt(r1039812);
return r1039813;
}