bmi = weight/(height*height)

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 32<bmi:

   print('严重肥胖')

else:

    pass