Programming basics Exam 18Dec 04. Grades

https://judge.softuni.bg/Contests/Practice/Index/368#3
using System;
namespace Testing
{
    class MainClass
    {
        public static void Main()
        {
            var numberOfStudents = int.Parse(Console.ReadLine());

            var topStudents = 0.0;
            var five = 0.0;
            var four = 0.0;
            var failed = 0.0;
            decimal grades = 0;
            decimal currentGrade = 0;

            for (int i = 0; i < numberOfStudents; i++)
            {
                currentGrade = decimal.Parse(Console.ReadLine());
                grades += currentGrade;
                if (currentGrade >= 5)
                {
                    topStudents++;
                }
                if (currentGrade <= 4.99M && currentGrade >= 4.00M)
                {
                    five++;
                }
                if (currentGrade <= 3.99M && currentGrade >= 3.00M)
                {
                    four++;
                }
                if (currentGrade < 3.00M)
                {
                    failed++;
                }
            }
            var topStudentPrc = topStudents * 100 / numberOfStudents;
            var fivePrc = (five / numberOfStudents) * 100;
            var fourPrc = four * 100 / numberOfStudents;
            var failedPrc = failed * 100 / numberOfStudents;
            var averageGrade = grades / numberOfStudents;

            Console.WriteLine("Top students: {0:f2}%", topStudentPrc);
            Console.WriteLine("Between 4.00 and 4.99: {0:f2}%", fivePrc);
            Console.WriteLine("Between 3.00 and 3.99: {0:f2}%", fourPrc);
            Console.WriteLine("Fail: {0:f2}%", failedPrc);
            Console.WriteLine("Average: {0:f2}", averageGrade);
        }
    }
}