using System.Numerics;

public class Program
{
    public static void Main()
    {

        //BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] moji = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string moji = Console.ReadLine() ?? string.Empty;

        long[] ints = new long[3];
        for(int i = 0;i < num;i++)
        {
            long number = 0;
            try
            {
                number = long.Parse(Console.ReadLine() ?? string.Empty);
            }
            catch 
            {
                Console.WriteLine("assert");
                return;
            }
            ints[i] = number;
        }
        Array.Sort(ints);

        Console.WriteLine(ints[2] + ints[0]); 

    }
}