PROGRAMMING:Recursive calling of function

There are n people sitting together. The nth person is 2 years older than the (n-1)th person, the (n-1)th person is 2 years older than the (n-2)th person, and so on. ...... The first person is 10 years old.How old is the nth person?
it is required using recursive function to caculate.
### Input Format:
Enter n to represent the nth person.
### Output Format:
Output the age of the nth person
### Sample Inputs:
```in
five
```
### Sample Output:
```out
the age of the 5th person is 18
```







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