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Problem B
A Real Challenge
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Input
The input consists of a single integer $a$ ($1 \le a \le 10^{18}$), the area in square meters of Old MacDonald’s pasture.
Output
Output the total length of fence needed for the pasture, in meters. The length should be accurate to an absolute or relative error of at most $10^{-6}$.
Sample Input 1 | Sample Output 1 |
---|---|
16 |
16 |
Sample Input 2 | Sample Output 2 |
---|---|
5 |
8.94427190999915878564 |