PROGRAMMING:an=1/(1+a(n-1))
Calculate the nth term of the sequence.
###Input format:
Enter n value directly, n value is a positive integer.
###Output format:
Directly output the real result with 6 decimal places, without any additional characters..
###Input example:
```in
five
```
###Output example:
```out
zero point six two five zero zero zero
```
answer：If there is no answer, please comment
###Input format:
Enter n value directly, n value is a positive integer.
###Output format:
Directly output the real result with 6 decimal places, without any additional characters..
###Input example:
```in
five
```
###Output example:
```out
zero point six two five zero zero zero
```
answer：If there is no answer, please comment