import java.util.Scanner;
class  S
{
    public static void main(String[] args) 
    {
        Scanner s= new Scanner(System.in);
        System.out.println("请输入一个数:");
        int score = s.nextInt();
 if (score < 0 || score > 100) 
{ 
  System.out.println("不合法"); 
  System.exit(0); 
 } 
	int n = score/10;
	String grade;
	switch(n)
	{
	
	case 10:
	grade ="优秀";
	break;
	case 8:
	grade ="及格";
	break;
	default:
	grade ="不及格";
	break;
	

         


}
 System.out.println(grade); 
    }