package temp;
import java.util.Scanner;

public class grade {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("請輸入學生成績:");
        int grade=scanner.nextInt();        
        switch(grade) {
        case '優':
    	    System.out.println(5);
    	    break;
        case '良':
    	    System.out.println(4);
    	    break;
        case '中':
    	    System.out.println(3);
    	    break;	
        case '差':
    	    System.out.println(2);
    	    break;
        default:
    	    System.out.println("輸入的等級錯誤");
    	    break;
        }
    }
}