double f(double a, double b, double c) {
double r3143840 = a;
double r3143841 = b;
double r3143842 = r3143840 + r3143841;
double r3143843 = c;
double r3143844 = r3143842 + r3143843;
double r3143845 = 2.0;
double r3143846 = r3143844 / r3143845;
double r3143847 = r3143846 - r3143840;
double r3143848 = r3143846 * r3143847;
double r3143849 = r3143846 - r3143841;
double r3143850 = r3143848 * r3143849;
double r3143851 = r3143846 - r3143843;
double r3143852 = r3143850 * r3143851;
double r3143853 = sqrt(r3143852);
return r3143853;
}