#include <iostream>
using namespace std;
class A {
int x;
public:
A(int i = 0) { x = i; }
A operator+(const A& a) { return x + a.x; }
template <class T>
ostream& operator<<(ostream&);
};
template <class T>
ostream& A::operator<<(ostream& o)
{
o << x;
return o;
}
int main()
{
A a1(33), a2(-21);
cout << a1 + a2;
return 0;
}