double f(double a, double b, double c) {
double r26470133 = a;
double r26470134 = b;
double r26470135 = r26470133 + r26470134;
double r26470136 = c;
double r26470137 = r26470135 + r26470136;
double r26470138 = 2.0;
double r26470139 = r26470137 / r26470138;
double r26470140 = r26470139 - r26470133;
double r26470141 = r26470139 * r26470140;
double r26470142 = r26470139 - r26470134;
double r26470143 = r26470141 * r26470142;
double r26470144 = r26470139 - r26470136;
double r26470145 = r26470143 * r26470144;
double r26470146 = sqrt(r26470145);
return r26470146;
}