using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

    }

    ~Program(){}

}

​

public class Singleton{

    private Singleton(){}

    private static Singleton instance;

    public static Singleton Instance(){

        if(instance == null){

            return new Singleton();

        }

        else{

            return instance;

        }

​

    }

}