#include <iostream>

int const letter_count = 10;
using namespace std;

class B {
    int i_;
public:
    B(int i) : i_(i) {}
    int inc() { return doInc(); }
protected:
    virtual int doInc() { return ++i_; }

};

class D1 : public B {
public:
    D1(int i) : B(i-1) {}
protected:
    virtual int doInc() { return B::doInc(); }
};

class D2 : public B {
public:
    D2(int i) : B(i-2) {}
protected:
    virtual int doInc() { return 3; }
};

class M :  public D1, public D2 {
public:
    M(int i) : D1(i), D2(i) {}
protected:
    virtual int doInc() { return D1::doInc() + D2::doInc(); }
};

void zad3() {
    M m(letter_count);
    D1& ref1 = static_cast<D1&>(m);
    cout << ref1.inc();
    cout << endl;
    D2& ref2 = static_cast<D2&>(m);
    cout << ref2.inc();
    cout << endl;
}

int main()
{
    zad3();
    return 0;
}