#include <iostream>
using namespace std;
class A
{
protected:
int x;
public:
A(int i) : x(i) {}
int get_x() { return x; }
};
class B : private A
{
protected:
int y;
public:
B(int i, int j) : y(i), A(j) {}
int get_y() { return get_x() + y; }
};
class C : private B
{
protected:
int z;
public:
C(int i, int j, int k) : z(i), B(j, k) {}
int get_z() { return get_x() + get_y() + z; }
};
int main()
{
C c(1, 2, 3);
cout << c.get_z();
return 0;
}