using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var testQueue = new Queue<int>();

        testQueue.Enqueue(1);

        testQueue.Enqueue(2);

        testQueue.Enqueue(3);

        Console.WriteLine(testQueue.Peek());

        testQueue.Dequeue();

        Console.WriteLine(testQueue.Peek());

    }

}