using System;

public class Program

{

    public static void Main()

    {

        int nilai;

        Console.Write("Input Nilai = ");

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

        if(nilai>=80){

            Console.WriteLine("Grade A");

        }

        else if(nilai>=75){

            Console.WriteLine("Grade B+");

        }

        else if(nilai>=70){

            Console.WriteLine("Grade B");

        }

        else if(nilai>=65){

            Console.WriteLine("Grade C+");

        }

        else if(nilai>=60){

            Console.WriteLine("Grade C");

        }

        else if(nilai>=55){

            Console.WriteLine("Grade D+");

        }

        else if(nilai>=50){

            Console.WriteLine("Grade D");

        }

        else{

            Console.WriteLine("Grade E");

        }

    }

}