using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List <int> A = new List<int>(){57,8,55,35,68,86,3,38,48,92,97,78,14,57,25,24,17,77,97,71,31,40,46,40,57,18,94,84,0,22,4,21,80,74,71,76,20,48,43,68,32,67,0,23,7,6,25,94,5,35,65,93,74,13,32,41,31,49};

        //a.SetValue(5,0);      

        int count = 0;

        foreach(int x in A){

            count++;

        }

        int sum=0;

        int sumCount=0;

        List <int> maxEvenSum = new List<int>();

        for(int i =0; i<count;i++){

            for(int j=i+1; j<count; j++){

                sum = A[i]+A[j];

                if(sum>=2 && sum%2==0){

                    maxEvenSum.Add(sum);

                    sumCount++;

                }

            }

        }

        if(maxEvenSum.Count>0){

            int maxSum = int.MinValue;

            foreach (int x in maxEvenSum)

            {

                if (x > maxSum)

                {

                    maxSum = x;

                }

            }

            Console.WriteLine(maxSum);

        }

        else

            Console.WriteLine(0);       

    }

}