Square

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

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

Input

The length of a diagonal $d (1 \leq d \leq 1 0^{18})$ .

Print the length of the side of a square.

Input #1

Answer #1

Submissions 2K

Acceptance rate 30%