The length of a circle
Execution time limit is 1 second
Runtime memory usage limit is 64 megabytes
Determine the circumference of a circle, denoted as S, given its radius R. The radius must satisfy the condition 0 < R < 1000.
Input
A single real number R.
Output
A single real number S, rounded to three decimal places.
Examples
Input #1
Answer #1
Input #2
Answer #2
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