2016_18_Dec_Grades

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

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

            int topStudents = 0;
            int goodStudents = 0;
            int midStudents = 0;
            int failStudents = 0;

            double gradeSum = 0;

            for (int i = 0; i < n; i++)
            {
                double grade = double.Parse(Console.ReadLine());
                if (grade < 3)
                    failStudents++;
                else if (grade >= 3 && grade < 4)
                    midStudents++;
                else if (grade >= 4 && grade < 5)
                    goodStudents++;
                else
                    topStudents++;

                gradeSum += grade;  //по този начин на всеки студент прибавяме сумата
            }
            Console.WriteLine($"Top students: {(100 / (n / (double)topStudents)):f2}%");
            Console.WriteLine($"Between 4.00 and 4.99: {100 / (n / (double)goodStudents):f2}%");
            Console.WriteLine($"Between 3.00 and 3.99: {100 / (n / (double)midStudents):f2}%");
            Console.WriteLine($"Fail: {100 / (n / (double)failStudents):f2}%");
            Console.WriteLine($"Average: {(gradeSum / n):f2}");
        }
    }
}