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

class Magatro
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        int[] C = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();
        long kyoutaku = C.Sum()/10;
        int cnt = 0;
        for(int i = 0; i < N; i++)
        {
            cnt += kyoutaku < C[i] ? 0 : 1;
        }
        Console.WriteLine(cnt*30);
    }
}