04. Grades

using System;

namespace Grades
{
    class Program
    {
        static void Main(string[] args)
        {
            int student = int.Parse(Console.ReadLine());
            double grade3 = 0;
            double grade4 = 0;
            double grade5 = 0;
            double grade6 = 0;
            double gradeSum = 0;

            for (int i = 0; i < student; i++)
            {
                double grade = double.Parse(Console.ReadLine());

                if (grade >= 5)
                {
                    grade6++;
                }
                else if (grade >= 4)
                {
                    grade5++;
                }
                else if (grade >= 3)
                {
                    grade4++;
                }
                else if (grade >= 2)
                {
                    grade3++;
                }
                gradeSum += grade;
            }
            double average = gradeSum / student;

            Console.WriteLine($"Top students: {grade6 / student * 100:f2}%");
            Console.WriteLine($"Between 4.00 and 4.99: {grade5 / student * 100:f2}%");
            Console.WriteLine($"Between 3.00 and 3.99: {grade4 / student * 100:f2}%");
            Console.WriteLine($"Fail: {grade3 / student * 100:f2}%");
            Console.WriteLine($"Average: {average:f2}");

        }