using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var ok = 0;
        var ng = 100_000_000;
        while (ng - ok > 1)
        {
            var mid = (ok + ng) / 2;
            var less = 0;
            var more = 0;
            for (var i = 0; i < c.Length; ++i)
            {
                if (mid >= c[i]) less += mid - c[i];
                else more += (c[i] - mid) / 2;
            }
            if (more >= less) ok = mid;
            else ng = mid;
        }
        WriteLine(ok);
    }
}