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

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());

            int a = 0;
            int b = 0;
            int c = 0;

            List<int> li = new List<int>();
            List<int> ali = new List<int>();

            try
            {
                for(int i = 0;i < N; i++)
                {
                    li.Add(int.Parse(Console.ReadLine()));
                }
                a = li[0] + li[1];
                b = li[1] + li[2];
                c = li[2] + li[0];

                li[0] = a;
                li[1] = b;
                li[2] = c;

                li.Sort((d, e) => e - d);

                foreach (int i in li)
                {
                    if (!ali.Contains(i))
                    {
                        ali.Add(i);
                    }
                }

                Console.Write(ali[1]);

            }
            catch
            {
                Console.Write("assert");
            }

            Console.ReadLine();
        }
    }
}