a = float(input())
b = float(input())
c = float(input())
d = float(input())
e = float(input())
dtb = (a + b + c + d + e) / 5
if 9 <= dtb:
    print('Xuất sắc')
elif 8 <= dtb:
    print('Giỏi')
elif 7 <= dtb:
    print('Khá')
elif 5 <= dtb:
    print('Trung bình')
else:
    print('Yếu')
 
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