name=input('请输入姓名：')

a=input('请输入%s的身高(米):'% name)

b=input('请输入%s的体重(千克):'% name)

a=float(a)

b=int(b)

BMI=b/(a*a)

BMI=float(BMI)

if BMI <= 18.5:

    print('%s的体重过轻'% name)

elif 18.5<=BMI<=25:

    print('%s的体重正常'% name)

elif 25<=BMI<=28:

    print('%s的体重过重' % name)

elif 28<=BMI<=32:

    print('%s偏向肥胖'% name)

elif BMI>=32:

    print('%s严重肥胖'% name)