using System;

//Given an array A[] consisting numbers. The task is to write a function that returns wheather the given array is in Arithmetic Progression or not by returning 1 or 0.

//You can assume the array is always sorted and have positive numbers.

​

//Input: {12,19,22,25}

//Output: 0

​

//Input: {9,18,27}

//Output: 1

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}