using System;

​

public class Program

{

    int i, j;

    public Program()

    {

        i = 10;

        j = 20;

    }

    public Program(int x, int u)

    {

        i = x;

        j = u;

    }

    public Program(Program c)

    {

        i = c.i;

        j = c.j;

    }

    public static void Main()

    {

        Program p = new Program();

        Program u = new Program(90, 80);

        Program k = new Program(u);

        Console.WriteLine(p.i + "  " + p.j);

        Console.WriteLine(u.i + "  " + u.j);

        Console.WriteLine(k.i + "  " + k.j);

    }

}