using System;

using System.Collections.Generic;

​

namespace gradeBook

{

​

    public class Book

    {

        private List<double> grades = new List<double>();

        private Random random = new Random();

        public Book(int initial)

        {

            for(int i=0;i<initial;i++)

            {

                grades.Add((random.NextDouble()*60)+40);

            }

        }

        public double average()

        {

            double total=0;

            foreach(double number in grades)

            {

                total=total+number;

            }

            return total/grades.Count;

        }

        public void output()

        {

            if(this.average()>=70)

                Console.WriteLine($"The average is {this.average()}.");

            else

                Console.WriteLine($"You really are fucking trash, what is {this.average()}.");

        }

    }

    public class Program

    {

        public static void Main()

        {

            var book = new Book(20);

            book.output();

        }   

    }

}