PROGRAMMING:Judge the Constitution

Body mass index (BMI) is a commonly used international standard to measure the degree of obesity and health. BMI was calculated as follows:
Body mass index (BMI) = the square of weight (kg) / height (m).
|Obesity | BMI|
| -------- | -------- |
|Lean | BMI < 18.5|
|Normal | 18.5 < = BMI < 24|
|Overweight | 24 < = BMI < 28|
|Obesity | 28 < = BMI < 40|
|Very severe obesity | BMI > = 40|
###Input format:
Enter the weight and height values in one line
###Output format:
According to the BMI value, output the obesity degree in the table.
###Input example:
Here is a set of inputs. For example:
```in
62 1.71
```
###Output example:
The corresponding output is given here. For example:
```out
normal
```







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