using System;

namespace Yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var N = int.Parse(Console.ReadLine());
            Console.ReadLine();
            var firstNum = int.Parse(Console.ReadLine());
            int max = firstNum;
            int min = firstNum;
            for (int i = 0; i < N - 1; i++)
            {
                var num = int.Parse(Console.ReadLine());
                if(num < min)
                {
                    min = num;
                }else if(num > max)
                {
                    max = num;
                }
            }
            Console.WriteLine(max - min);
        }
    }
}