#include <iostream>
class C {
private:
    static int counter;

public:
    C() {
        ++counter;
        if (counter == 1)
            std::cout << "constructor C()\n";
    }

    C(const C& other) {
        ++counter;
        if (counter == 1)
            std::cout << "constructor C(const C&)\n";
    }

    C& operator = (const C& other) {
        return *this;
    }

    C& operator = (C&& other) {
        return *this;
    }

    ~C() {
        --counter;
        if (counter == 1)
            std::cout << "destructor C()\n";
    }
};
int C::counter = 0;