#include <iostream>
using namespace std;
class a
{
public:
	int num(){return 1;}
};
class b:public a
{
public:
	int num(){return 2;}
};
class c:public a
{
public:
	int num(){return 3;}
};
class d:public b,public c
{
public:
	//int num(){return 4;}
	int B(){return b::num();}
};
int main()
{
	d d;
	cout<<d.b::num()<<endl;
	return 0;
}