inline double Double(long double f) {return (double)(f);}
inline double Sqrt(double f) {return sqrt(f);}
inline double Abs(double a) {return fabs(a);}
inline double Double(long double f) {return (double)(f);}
inline double Sqrt(double f) {return sqrt(f);}
inline double Abs(double a) {return fabs(a);}