#include <iostream>


class Complex
{
    private:

    double real, unreal;

    public:

    Complex(double real, double unreal)
    {
        this->real = real;
        this->unreal = unreal;
    }

    Complex(double real) : Complex(real, 1.0) {}

    Complex() :Complex(0., 0.) {}

    ~Complex() {}

    double getReal() const { return real; }
    double getUnreal() const { return unreal; }

    void setReal(double real) { this->real = real; }
    void setUnreal(double unreal) { this->unreal = unreal; }

    //overloads

    Complex operator+(Complex& c)
    {
        Complex result(real + c.real, unreal + c.unreal);
        return result;
    }

    Complex operator-(Complex& c)
    {
        Complex result(real - c.real, unreal - c.unreal);
        return result;
    }

    Complex operator*(Complex& c)
    {
        double cReal = c.real, cUnreal = c.unreal;
        Complex result(real * cReal - unreal * cUnreal, real * cUnreal + cReal * unreal);
        return result;
    }

    Complex operator/(Complex& c)
    {
        double cReal = c.real, cUnreal = c.unreal;
        Complex result((real * cReal + unreal * cUnreal) / (cReal * cReal + cUnreal * cUnreal), (cReal * unreal - real * cUnreal) / (cReal * cReal + cUnreal * cUnreal));
        return result;
    }

    // operations with array

    Complex sum(Complex *arr, size_t s)
    {
        Complex res = 0;
        for (size_t i = 0; i < s; ++i) res = res + arr[i];
        return res;
    }

    Complex dif(Complex* arr, size_t s)
    {
        Complex res = 0;
        for (size_t i = 0; i < s; ++i) res = res - arr[i];
        return res;
    }

    Complex compos(Complex* arr, size_t s)
    {
        Complex res(1., 1.);
        for (size_t i = 0; i < s; ++i) res = res * arr[i];
        return res;
    }

    Complex div(Complex* arr, size_t s)
    {
        Complex res(1., 1.);
        for (size_t i = 0; i < s; ++i) res = res / arr[i];
        return res;
    }
};

std::ostream& operator<<(std::ostream& out, const Complex& c)
{
    double Real = c.getReal(), Unreal = c.getUnreal();

    if (Unreal >= 0) return out << Real << " + " << Unreal << "i";
    else return out << Real << " - " << -Unreal << "i";
}




int main()
{


    return 0;
}