using System;

public class Program

{

    public static void Main()

    {

        int[]arr=new int[]{0,2,5,7,8,9};

        Console.WriteLine( Issort(arr));

    }

    public static bool Issort (int[]arr)

    {

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

    {

        if (arr[i]>arr[i+1])

        {

            return false;

        }

    }

        return true;

    }

}