using System;

namespace exam_preparation
{
    class Program
    {
        static void Main()
        {
            string command = "";
            int Number_Of_Bad_Marks = Convert.ToInt32(Console.ReadLine());

            int Mark;
            int Count_Bad_Marks = 0;
            double Average_Mark;
            int Problems_Solved = 0;
            int Count_Marks = 0;
            int Sum_Of_Makrs = 0;
            string Last_Problem;
            //-----------------------------------------------------
            //-----------------------------------------------------
            do
            {

                Last_Problem = Console.ReadLine(); Problems_Solved++;
                Mark = Convert.ToInt32(Console.ReadLine()); Count_Marks++; Sum_Of_Makrs += Mark;
                if (Mark <= 4) { Count_Bad_Marks++; }
                if (Count_Bad_Marks == Number_Of_Bad_Marks) { break; }

            } while (command != "Enough");
                //-----------------------------------------------------
                //-----------------------------------------------------
                if ( Count_Bad_Marks == Number_Of_Bad_Marks )
            {
                Console.WriteLine($"You need a break, {Number_Of_Bad_Marks} poor grades.");
            }
            else
            {
                if (command == "Enough")
                {
                    Average_Mark = Convert.ToDouble(Sum_Of_Makrs) / Convert.ToDouble(Count_Marks);
                    Console.WriteLine($"Average score: {Average_Mark.ToString("F2")}");
                    Console.WriteLine($"Number of problems: {Problems_Solved}");
                    Console.WriteLine($"Last problem: {Last_Problem}");
                }
            }



        }
    }
}