#define KOKO              4
/******************************************************************************/
class cVec{
   protected:
     double x[KOKO];
     static double laiton;

   public:
     cVec( double a=0.0,double b=0.0,double c=0.0,double d=1.0)
     {x[0]=a; x[1]=b; x[2]=c; x[3]=d;}
     double &operator[](int i);
     const double &operator[](int i) const;
     cVec &operator=(const cVec &y);
     double operator*(const cVec &y) const;
     cVec &operator*(const double r);
     int operator==(const cVec &y) const;
};

/******************************************************************************/
class cJana{
  protected:
  public:
    cVec ap,lp;
    cJana(cVec a, cVec b){ ap=a; lp=b; }
};