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')

else:

    print('严重肥胖')

    pass