PROGRAMMING:Recursive call of function

There are n people sitting together, the nth person is 2 years older than the Nth-1 person, the Nth-1 person is 2 years older than the nth-2 person, and so on,..., the first person is 10 years old. How old is the nth person?
###Input format:
Enter an integer to represent the number of people.
###Output format:
The nth person is m-year-old.
###Input example:
```in
five
```
###Output example:
```out
Number 5 is 18 age!
```







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