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Problems

Square

Square

Time limit 1 second
Memory limit 128 MiB

Given the length of a diagonal of a square. Find the length of the side of this square.

Input data

The length of a diagonal d~(1 \le d \le 10^{18}).

Output data

Print the length of the side of a square.

Examples

Input example #1
2
Output example #1
1.41421356237309
Source ІІ stage of All-Ukrainian informatics olympiad in Zhitomyr region 17.12.2022