using System;
using System.Linq;

namespace yu_851
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.ReadLine();
            long[] x = Console.ReadLine().Split().Select(long.Parse).ToArray();
            if (x.Length > 1) Console.WriteLine("\"assert\"");
            else
            {
                long y = long.Parse(Console.ReadLine());
                long z = long.Parse(Console.ReadLine());
                long[] sum = new long[3];
                if (Array.IndexOf(sum, x[0] + y) < 0) sum[0] = x[0] + y;
                if (Array.IndexOf(sum, y + z) < 0) sum[1] = y + z;
                if (Array.IndexOf(sum, z + x[0]) < 0) sum[2] = z + x[0];

                Array.Sort(sum);
                Console.WriteLine(sum[1]);
            }
        }
    }
}