using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int kyotaku = 30;
        int kouhoCount = int.Parse(Reader.ReadLine());
        
        List<long> list = new List<long>();
        int[] inpt = Reader.GetInt();
        inpt.ToList().ForEach(a=>list.Add(a));
        
        long total = list.Sum();
        long kijun = total / 10;
        if(total % 10 > 0) {
            kijun++;
        }
        long ans = kyotaku * list.Where(a=>a <= kijun).Count();
        Console.WriteLine(ans);


        
    }



    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


5
400 250 200 100 50



 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}