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

class Program
{
    public void Solve()
    {
        int N = int.Parse(Console.ReadLine());
        string[] C = Console.ReadLine().Split(' ');

        int CSum = 0;
        for (int i = 0; i < N; i++) { CSum += int.Parse(C[i]); }

        int henkanLine = CSum / 10;
        int ans = 0;
        for (int i = 0; i < N; i++)
        {
            if (int.Parse(C[i]) <= henkanLine)
            {
                ans += 30;
            }
        }
        Console.WriteLine(ans);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}