package javaapplication2;

import java.util.Scanner;


public class JavaApplication2 {


    public static void main(String[] args) {

        int num;
        Scanner scan= new Scanner(System.in);

        num = scan.nextInt();

        if(num<40){
            System.out.println("Garde: F");
        }
        else if(num>=40 && num<45){
            System.out.println("Grade: D");
        }
        else if(num>=45 && num<50){
            System.out.println("Grade: C");
        }
         else if(num>=50 && num<55){
            System.out.println("Grade: C+");
        }
         else if(num>=55 && num<60){
            System.out.println("Grade: B-");
        }
         else if(num>=60 && num<65){
            System.out.println("Grade: B+");
        }
        else if(num>=65 && num<70){
            System.out.println("Grade: B");
        }

        else if (num>=70 && num<75){
            System.out.println("Grade: A-");
        }
         else if(num>=75 && num<80){
            System.out.println("Grade: A");
        }
         else{
             System.out.println("Grade: A+!");
        }

    }
}