double f(double a, double b, double c) {
double r2602940 = a;
double r2602941 = b;
double r2602942 = r2602940 + r2602941;
double r2602943 = c;
double r2602944 = r2602942 + r2602943;
double r2602945 = 2.0;
double r2602946 = r2602944 / r2602945;
double r2602947 = r2602946 - r2602940;
double r2602948 = r2602946 * r2602947;
double r2602949 = r2602946 - r2602941;
double r2602950 = r2602948 * r2602949;
double r2602951 = r2602946 - r2602943;
double r2602952 = r2602950 * r2602951;
double r2602953 = sqrt(r2602952);
return r2602953;
}