#include <iostream>

template <typename T>
class A {

    public:
    T m;


    A():m(7) {}


};

template <typename L, typename R, typename T>
T operator+(const L& levi, const R& desni) {

    return levi.m + desni.m;

}


int main(){

    A<int> a();
    A<int> b();
    std::cout << a + b;

    return 0;

}