using System;

​

namespace Program

{

    public class Program

    {   

        public static void Main(string[] args)

        {

            int a = 5;

            ref int b = ref a;

            Console.WriteLine(a);

            Console.WriteLine(b);

            a = 6;

            Console.WriteLine(a);

            Console.WriteLine(b);

            b = 7;

            Console.WriteLine(a);

            Console.WriteLine(b);

        }

    }

}

​