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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string input2 = Console.ReadLine();
            string[] vote = input2.Split(' ');
            int[] num = new int[vote.Length];
            int line = 0;
            int cnt = 0;
            for(int i=0;i<vote.Length;i++)
            {
                num[i] = int.Parse(vote[i]);
                line = line + num[i];
            }
            for(int i=0;i<num.Length;i++)
            {
                if(num[i]<=line/10)
                {
                    cnt++;
                }
            }
            Console.WriteLine(cnt * 30);
        }

    }
}