using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace YukiCoder_Cs
{
    class Program
    {
        public static void Main()
        {
            var N = int.Parse(Console.ReadLine());
            var K = int.Parse(Console.ReadLine());
            var list = new List<int>();
            for (int i = 0;i < N; ++i)
            {
                list.Add(int.Parse(Console.ReadLine()));
            }

            Console.WriteLine($"{list.Max() - list.Min()}");
        }
    }
}