using System;
using System.Linq;

public class P0191 {
    public static void Main() {
        var n = int.Parse(Console.ReadLine().Trim());
        var c = Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToList();
        var summary = c.Sum();
        Console.WriteLine(c.Where(i => i * 10 <= summary).Count() * 30);
    }
}