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

class Program
{
    static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        int[] c = Console.ReadLine().Split().Select(a => int.Parse(a)).ToArray();
        int ans = 0;

        int line = c.Sum() / 10;

        for (int i = 0; i < n; i++)
        {
            if (c[i] <= line)
            {
                ans++;
            }
        }

        Console.WriteLine(ans * 30);
        Console.ReadLine();
    }
}