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

namespace _04
{
    class Program
    {
        static void Main(string[] args)
        {
            int students = int.Parse(Console.ReadLine());

            int poorMarks = 0;

            for (int i = 1; i <= students; i++)
            {
                double marks = double.Parse(Console.ReadLine());

                if (marks <=22.5)
                {
                    poorMarks++;
                }


            }

            Console.WriteLine($"Poor marks: {poorMarks}%");
        }
    }
}