grade=30
if 80<=grade<=100:
	print('成绩优秀')
elif 60<=grade<=80:
	print('成绩中等')
else:
	print('成绩差')
if 20<=grade<60:
	print('再努力一把，还有救！')
else:
	print('你要比以前更努力才行，你可以的！')