def bmi(weight, height):
    return weight * height ** -2 

def bmi_category(bmi):
    if bmi < 18.5:
        return "underweight"
    elif bmi < 25:
        return "healthy"
    elif bmi < 30:
        return "overweight"
    elif bmi < 40:
        return "obese"
    else:
        return "severely obese"

weight = float(input("Weight? "))
height = float(input("Height? "))
bmi = bmi(weight, height)
print(f"BMI is {bmi:.3}")
print(f"The BMI is in the {bmi_category(bmi)} category")