using System.Linq;
using System;

public class Hello
{
    public static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        var asum = a.Sum();
        var count = 0;
        for (int i = 0; i < n; i++)
            if (a[i] * 10 <= asum) count++;
        Console.WriteLine(count * 30);
    }
}