#include <iostream>

using namespace std;

class Cl2;

class Cl1

{

	int x;

public:

	Cl1(int a) :x(a) {}

	friend int sum(Cl1, Cl2);
	~Cl1()
	{
		cout << "bebebbe";
	}

};

class Cl2

{

	int y, z;

	friend int sum(Cl1, Cl2);

public:

	Cl2(int b, int c) :y(b), z(c) {}
	~Cl2()
	{
		cout << "huiiiii" << endl;
	}
};

int sum(Cl1 s, Cl2 f)

{

	return s.x + f.y + f.z;

}

int main()

{

	Cl1 m1(10);

	Cl2 m2(20, 30);

	cout << sum(m1, m2) << endl;//60

	return 0;

}