PROGRAMMING:π/ 2 ≈ 1 + 1 / 3 + 1 / 3 * 2 / 5 +... Find π
Calculate according to the following expression π The approximate value of. The error is not more than 0.00001.
###Output format:
Directly output the real result with 6 decimal places, without any additional characters.
###Output example:
```out
three point one four one five six six
```
answer：If there is no answer, please comment
###Output format:
Directly output the real result with 6 decimal places, without any additional characters.
###Output example:
```out
three point one four one five six six
```
answer：If there is no answer, please comment