using System;

public class Program

{

    public struct Otri 

    {

        public int X;

        public int Y;

        public Point P;

    }

    public class Point

    {

        public int X {get;set;}

        public int Y {get;set;}

    }

    public static void Main()

    {

        Otri o1 =new Otri();

        o1.X = 1;

        o1.Y = 2;

        Point p =new Point();

        p.X = 10;

        p.Y = 20;

        o1.P= p;

        Otri o2 = o1;

        o2.X = 3;

        o2.Y = 4;

        Console.WriteLine(o1.X);

        Console.WriteLine(o1.Y);

        Console.WriteLine(o1.P.X);

        Console.WriteLine(o1.P.Y);

        Console.WriteLine(o2.X);

        Console.WriteLine(o2.Y);

        Console.WriteLine(o1.Y);

    }

}