using System;

​

public class Program

{

    public static void Main()

    {

        string name;

        int a;

        int total;

        Console.WriteLine("Hello I'll help you to calculate your average.What's your  name?");

        name = Console.ReadLine();

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

        Console.WriteLine();

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

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

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

        {

            if (i == 1)

            {

                Console.WriteLine("Write the first number");

                total += int.Parse(Console.ReadLine());

            }

            else if (i == a)

            {

                Console.WriteLine("Write the last number");

                total += int.Parse(Console.ReadLine());

            }

            else

            {

                Console.WriteLine("Write the next number");

            }

​

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

            total += a;

            if (a <= 69)

            {

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

            }

            else

            {

                Console.writeLine("Good you pased");

            }

        }

    }

}