void update_val(int new_val)
     {
        if(new_val<1 || new_val>10000) return;

        while(val < new_val)
        {
            if((new_val/val)%5 == 0)
                C::func(val);
            if((new_val/val)%3 == 0)
                B::func(val);
            if((new_val/val)%2 == 0)
                A::func(val);
        }
     }