bmi = weight/(height**2)

if bmi<18.5:

   print('小明过轻')

elif 18.5<=bmi<25:

   print('小明正常')

elif 25<=bmi<28:

   print('小明过重')

elif 28<=bmi<32:

   print('小明肥胖')

else:

   print('严重肥胖')