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

namespace yukicoder
{
    class yc
    {
        static void Main()
        {
            int steal, sum = 0, cout = 0;
            int N = int.Parse(Console.ReadLine());
            string[] str = Console.ReadLine().Split(' ');
            int[] n = new int[N];
            
            
            for (int i = 0; i < N; i++)
            {
                n[i] = int.Parse(str[i]);
                sum += n[i];
            }
            steal = sum / 10;

            for (int i = 0; i < N; i++)
            {
                if (n[i] <= steal)
                {
                    cout++;
                }
            }

            Console.WriteLine(cout * 30);
        }
    }
}