using System;

​

public class Program

{

    public static void Main()

    {

        var input = new[]

        {

        "100", "89", "79", "69", "50","-1"

        };

        Console.WriteLine("Enter average (-1 to quit): ");

        int usersInput;

        //var usersInputRaw = Console.ReadLine();

        //usersInput = int.Parse(usersInputRaw);

        usersInput = int.Parse( input[0]);

        int i = 1;

        while (usersInput != -1)

        {

            qualityPoints(usersInput);

            //usersInputRaw = Console.ReadLine();

            //usersInput = int.Parse(usersInputRaw);

            usersInput =int.Parse( input[i]);

            i++;

        }

    }

​

    static void qualityPoints(int inputNumber)

    {

        if (inputNumber >= 90 && inputNumber <= 100)

        {

            Console.WriteLine("Point is 4");

        }

​

        if (inputNumber >= 80 && inputNumber <= 89)

        {

            Console.WriteLine("Point is 3");

        }

​

        if (inputNumber >= 70 && inputNumber <= 79)

        {

            Console.WriteLine("Point is 2");

        }

​

        if (inputNumber >= 60 && inputNumber <= 69)

        {

            Console.WriteLine("Point is 1");

        }

​

        if (inputNumber < 60)

        {

            Console.WriteLine("Point is 0");

        }

    }

}