Grades

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

namespace Loops
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter number of grades: ");
            int n = int.Parse(Console.ReadLine());
            double sum = 0;
            double max = double.MinValue;
            double min = double.MaxValue;
            for (int i = 1; i <= n; i++)
            {
                Console.Write($"Enter grade {i}: ");
                double grade = double.Parse(Console.ReadLine());
                sum += grade;
                if (grade < min)
                {
                    min = grade;
                }
                if (grade > max)
                {
                    max = grade;
                }
            }
            // Console.WriteLine($"Sum = {sum}");
            Console.WriteLine($"Min grade = {min:F2}");
            Console.WriteLine($"Max grade = {max:F2}");
            double average = sum / n;

            string words = "";
            if (average < 3.00)
            {
                words = "Poor";
            }
            else if (average < 3.50)
            {
                words = "Average";
            }
            else if (average < 4.50)
            {
                words = "Good";
            }
            else if (average < 5.50)
            {
                words = "Very good";
            }
            else
            {
                words = "Excellent";
            }

            Console.WriteLine($"Average grade = {words} ({average:F2})");
        }
    }
}