Problem
Given the radius of a circle, calculate and print its circumference. Use `3.14` as the value for Pi. The output should be a floating-point number.
Input format
Input
input.txt
- A single integer R (1 ≤ R ≤ 100)
Output format
Output
output.txt
- A single floating-point number: the circumference of the circle (2 * Pi * R)
Example
input
5
output
31.40
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Sample cases (from the problem)
Sample Case 1
Input
5
Expected output
31.40
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