ExamPreparation

using System;

namespace ExamPreparation
{
    class Program
    {
        static void Main(string[] args)
        {
            int poorGrades = int.Parse(Console.ReadLine());
            string problemName = "";

            int problems = 0;
            int fails = 0;
            double sum = 0;
            string lastProblem = "";

            bool isEnough = false;

            while (!isEnough)
            {
                problemName = Console.ReadLine();

                if (problemName == "Enough")
                {
                    isEnough = true;
                    break;

                }

                int problemGrade = int.Parse(Console.ReadLine());
                sum += problemGrade;
                problems++;

                if (problemGrade <= 4)
                {
                    fails++;
                }

                if (fails >= poorGrades)
                {

                    isEnough = true;
                }
                lastProblem = problemName;
            }

            if (problemName == "Enough")
            {
                Console.WriteLine($"Average score: {sum / problems:f2}");
                Console.WriteLine($"Number of problems: {problems}");
                Console.WriteLine($"Last problem: {lastProblem}");
            }
            else
            {
                Console.WriteLine($"You need a break, {fails} poor grades.");
            }
        }
    }
}