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

namespace No21
{

	class MainClass
	{
		public static void Main (string[] args)
		{
			var n = Convert.ToInt32(Console.ReadLine ());
			Console.ReadLine ();

			List<int> outputs = new List<int> ();

			for (int i = 0; i < n; i++) {
				outputs.Add(Convert.ToInt32(Console.ReadLine()));
			}
			var diff = outputs.Max () - outputs.Min ();
			Console.WriteLine (diff.ToString ());
		}
	}
}