using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4");
            WillReturn.Add("500 300 200 100");
            //30
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("5");
            WillReturn.Add("400 250 200 100 50");
            //60
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("5");
            WillReturn.Add("200 200 200 200 200");
            //0
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        int[] CArr = InputList[1].Split(' ').Select(X => int.Parse(X)).ToArray();

        int SumHyou = CArr.Sum();
        Console.WriteLine(30 * CArr.Count(X => X * 10 <= SumHyou));
    }
}