using System;

​

public class Program

{

    public static void Main()

    {

        //Maximiliano Ortiz 

        string name;

        int classes;

        double sum = 0;

        double average;

        double result;

        Console.WriteLine("Hi! I will help you to calculate your average. What is your name ?");

        name = Console.ReadLine();

        Console.WriteLine("Nice to meet you " + name + "!");

        Console.WriteLine("Now, " + name + ", how many classes are you studying?");

        classes = int.Parse(Console.ReadLine());

        for (int i = 1; i <= classes; i++)

        {

            if (i == 1)

            {

                Console.WriteLine("Please write the result of the first class");

                result = int.Parse(Console.ReadLine());

                sum += result;

                if (result > 100)

                {

                    Console.WriteLine("Sorry, please try again");

                }

                else if (result >= 70)

                {

                    Console.WriteLine("Good, you passed!");

                }

                else 

                {

                    Console.WriteLine("Sorry, you failed");

                }

            }

            else if (i == classes)

            {

                Console.WriteLine("Please write the result of the last class");

                result = int.Parse(Console.ReadLine());

                sum += result;

                if (result > 100)

                {

                    Console.WriteLine("Sorry, please try again");

                }

                else if (result >= 70)

                {

                    Console.WriteLine("Good, you passed!");

                }

                else 

                {

                    Console.WriteLine("Sorry, you failed");

                }

            }

            else

            {

                Console.WriteLine("Please write the result of the next class");

                result = int.Parse(Console.ReadLine());

                sum += result;

                if (result > 100)

                {

                    Console.WriteLine("Sorry, please try again");

                }

                else if (result >= 70)

                {

                    Console.WriteLine("Good, you passed!");

                }

                else 

                {

                    Console.WriteLine("Sorry, you failed");

                }

            }

        }

​

                average = sum / classes; 

                Console.WriteLine("Your average is: " + average);

    }

}