using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            string[] s = Console.ReadLine().Split(' ');
            int[] b = new int[a];
            int min = 0;
            int max=0;
            int ans = 0;
            for (int i=0;i<a;i++)
            {
                b[i] = int.Parse(s[i]);
            }
            for(int x = 0; x < a; x++)
            {
                if (min==0)
                {
                    min = b[x];
                    if (min > max)
                    {
                        max = min;
                    }
                }
                if (b[x] > max)
                {
                    max = b[x];
                }
                if (ans > max - min && min != 0 && max != 0)
                {
                    ans = max - min;
                }
                if (max == min)
                {
                    ans = min;
                }
                
            }
            Console.WriteLine(ans);
            
        }
    }
}