using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());
        int[] C = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        int henkanLine = C.Sum() / 10;

        Console.WriteLine(C.Where(x => x <= henkanLine).Count() * 30);
    }
}