using System;

​

public class Program

{

    public static void Main()

    {

        int[] a = new int[]{1, 2, 3, 4, 5, 6};

        Console.WriteLine(amer(a));

    }

​

    public static bool amer(int[] arr)

    {

        for (int i = 0;i<arr.Length - 1; i++)

        {

            if (arr[i]!=arr[i + 1] - 1)

            {

            return false;   

            }

        }

​

        return true;

    }

}