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


namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int nn = int.Parse(Console.ReadLine());
            var va = Console.ReadLine().Split().Select(int.Parse);
            var sm = va.Sum();
            var kk = va.Count(n => n * 10 <= sm) * 30;
            Console.WriteLine(kk);
            Console.ReadLine();
        }
    }
}