using static System.Console;

class Complex {

    private int real;

    private int imaginary;

    public Complex(int i, int j) {

        real = i;

        imaginary = j;

    }

    public override bool Equals(object o) => ((Complex)o).real == this.real && ((Complex)o).imaginary == this.imaginary;

    public override string ToString() => string.Format("{0} + {1}i", real, imaginary);

    public override int GetHashCode() => this.ToString().GetHashCode();

    public static bool operator == (Complex x, Complex y) => x.Equals(y);

    public static bool operator != (Complex x, Complex y) => !x.Equals(y);

    public static Complex operator +(Complex x, Complex y) => new Complex(x.real + y.real, x.imaginary + y.imaginary);

}

public class Program {

    public static void Main() {

        var x = new Complex(10,20);

        WriteLine(x);

        var y = new Complex(10,20);

        WriteLine(y);

        var z = y;

        WriteLine(z);

        if (x == y) WriteLine("z igual y");

        else WriteLine("x diferente y");

        if (y != z) WriteLine("y diferente z"); 

        else WriteLine("y igual z");

    }

}