height=1.75

weight=80.5

BMI=weight/height**2

if BMI<18.5:

    print('过轻')

elif 18.5<=BMI<=25:

    print('正常')

elif 25<BMI<28:

    print('过重')

elif 28<BMI<=32:

    print('肥胖')

elif BMI>32:

    print('严重肥胖')