#include <iostream>
#include <exception>
#include <deque>

using namespace::std;

class Verem:protected deque<int>{
    public:
        Verem(int n=0, int val=0){
        for (int i=0; i<n; i++)push_back(val);
        }

        void push(int e){
            push_back(e);
        }

        int pop()throw (range_error){
            if (empty()==1)
                throw range_error ("kutyafule");
             int tmp=back();
            pop_back();
            return tmp;

        }

        bool empty() const{
        return deque<int>::empty() ;
        }

        int size(){
            return deque<int>::size();
        }

        void print(){
            iterator itr;
            for(itr = this->begin(); itr != end(); ++itr)
                cout<<*itr<<endl;

        }

};

class Szamologep:private Verem{
    public:
        Szamologep(int n,int val) :Verem (n,val){}

        void osszead(){
            int tmp1,tmp2;
            tmp1=back();
            pop();
            tmp2=back();
            pop();
            push((tmp1+tmp2));

        }

        void szoroz(){
            int tmp1,tmp2;
            tmp1=back();
            pop();
            tmp2=back();
            pop();
            push((tmp1*tmp2));

        }

        void oszt() {
            int op1 = pop();
            int op2 =pop();
            if (op1 == 0) throw ("Szamologep::oszt - nullával oszt");
            push(op2/op1);
}

        void kiir(){
            cout<<back()<<endl;

        }


        void operator >>(int a){
            push(a);
        }


};

int main(){


    try{


        Szamologep sz1(3,4);
        sz1>>8;
        cout<<"eredeti tomb:"<<endl;
        //sz1.print();
        //cout<<"eddig"<<endl;
        sz1.osszead();
        //sz1.print();
        sz1.kiir();
        //cout<<"eddig"<<endl;
        sz1>>0;

        sz1.oszt();
        //sz1.print();


    }catch (range_error)  {cout<<"HIBA:"<<endl;}
    catch (char*s) {cout<<"malacfej"<<s<<endl; }
    return 0;
}