height = 1.75
weight = 80.5
BMI = weight / (height**2)
print('小明的BMI是%.1f'%BMI)
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')