Exam Preparation

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

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

            int problemsSolved = 0;
            double gradeAcumulate = 0.0;
            int badGradesAcumulate = 0;
            string lastProblemSolved = "0";

            while (badGradesAcumulate < badGradesBreack)
            {
                string problemName = Console.ReadLine();

                if (problemName == "Enough")
                {
                    break;
                }
                else
                {
                    double grade = double.Parse(Console.ReadLine());

                    if (grade <= 4)
                    {
                        problemsSolved++;
                        badGradesAcumulate++;
                        gradeAcumulate += grade;
                        lastProblemSolved = problemName;
                    }
                    else
                    {
                        problemsSolved++;
                        gradeAcumulate += grade;
                        lastProblemSolved = problemName;
                    }
                }
            }

            if (badGradesAcumulate < badGradesBreack)
            {
                double gradeAverage = 1.00 * gradeAcumulate / problemsSolved;
                Console.WriteLine($"Average score: {gradeAverage:f2}");
                Console.WriteLine($"Number of problems: {problemsSolved}");
                Console.WriteLine($"Last problem: {lastProblemSolved}");
            }
            else
            {
                Console.WriteLine($"You need a break, {badGradesAcumulate} poor grades.");
            }
        }
    }
}