height = 1.75
weight = 80.5

bmi = float(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")