using System;

public class Program

{

    public static void Main()

    {

        int [] arr = new int[6]{3,6,4,2,8,1};

        Console.WriteLine(SmallestGap(arr));

    }

    public static int SmallestGap(int[] arr)

    {

        int Count;

        int Min = 0;

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

        {

            Count = arr[i] - arr[i+1];

            if (Count < Min)

            {

                Min = Count;

            }

        }

        return Math.Abs(Min);

    }

}