#129. Circle length
You get the radius r of a circle. Find its length with the formula `2 * 3.14 * r` and print it with 2 decimal places.
### Input
Each on its own line: r (1 ≤ value ≤ 30).
### Output
A decimal number.
Examples
Input
30
Output
188.40
Input
3
Output
18.84
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.