class B : public A
{
 public:
    int XplusY(int x, int y)
    {
        return x+y;
    };
    double XplusY(int x1, int x2,int y)
    {
        return x1*x2+y;
    };
    double operator () (int x1, int x2,int y)
    {
     return XplusY(x1,x2,y);
    };
};