using System;

public class Program

{

    public static void Main()

    {

        /*

        Test case 1 input : {2, 4, 6, 3, 7, 8}

                    output : 5

        Test case 2 input : {1, 2, 3, 5}

                    output : 4

        Test case 3 input : { -2,-3,-1,0,2,3 }

                    output: 1

        */

    }

}