//เขียนโปรแกรมโดย นุษบา ไชยเดช

using System;

public class Program

{

    public static void Main()

    {

        int  AQI;

        Console.Write("Air Quality Index =");

        AQI=Int32.Parse(Console.ReadLine());

        if (AQI>=301){

            Console.WriteLine("That’s mean = Hazardous");

        }

        else{

            if(AQI>=201){

                Console.WriteLine("That’s mean = Very Unhealthy");  

            }

            else{

            if(AQI>=151){

                Console.WriteLine("That’s mean = Unhealthy");   

            }

                else{

            if(AQI>=101){

                Console.WriteLine("That’s mean = Unhealthy for Sensitive Groups");  

            }

                    else{

                        if(AQI>=51){

                Console.WriteLine("That’s mean = Moderate");    

            }

                        else{

                Console.WriteLine("That’s mean = Good");    

                        }

                    }

                 }

            }

        }   

    }

}