#include <iostream>

int mem = 1;

class Vect {
public:
    int &operator*() const {
        return mem;
    }
    void change(Vect &s, const Vect &t) {
        *t = *s + *t;
    }
};



int main() {
    /*
    Vect a = Vect();
    const Vect b = Vect();
    a.change(a, b);
    */
}