#include <cmath>

class Complex {
private:
    double re, im;
public:
    Complex(double real = 0, double image = 0) {
        re = real;
        im = image;
    }
    double Re() const {
        return re;
    }
    double Im() const {
        return im;
    }
    Complex operator+() {
        return *this;
    }
    Complex operator-() {
        return {-re, -im};
    }
};

Complex operator+(const Complex& c1, const Complex& c2) {
    return {c1.Re() + c2.Re(), c1.Im() + c2.Im()};
}

Complex operator-(const Complex& c1, const Complex& c2) {
    return {c1.Re() - c2.Re(), c1.Im() - c2.Im()};
}

Complex operator*(const Complex& c1, const Complex& c2) {
    return {c1.Re() * c2.Re() - c1.Im() * c2.Im(), c1.Re() * c2.Im() + c1.Im() * c2.Re()};
}

Complex operator/(const Complex& c1, const Complex& c2) {
    return {(c1.Re() * c2.Re() + c1.Im() * c2.Im()) / (c2.Re() * c2.Re() + c2.Im() * c2.Im()),
    (c2.Re() * c1.Im() - c1.Re() * c2.Im()) / (c2.Re() * c2.Re() + c2.Im() * c2.Im())};
}

bool operator==(const Complex& c1, const Complex& c2) {
    return c1.Re() == c2.Re() && c1.Im() == c2.Im();
}

bool operator!=(const Complex& c1, const Complex& c2) {
    return c1.Re() != c2.Re() || c1.Im() != c2.Im();
}

double abs(const Complex& c) {
    return sqrt(c.Re() * c.Re() + c.Im() * c.Im());
}