#include<stdio.h>
int main(){
		int grade;
	printf("please enter your grade:\n");
	scanf("%d",&grade);
	printf("你的等级是：\n");
	if(grade>=90){
		printf("优秀");
	}
	else if(grade>=80&&grade<90){
		printf("良好");
	}
	else if(grade>=60&&grade<80){
		printf("合格");
	}
	else if(grade<60){
		printf("不合格");
	}
	else{
			printf("please enter gagin"); 
	}
	return 0;
}