Description

In C++, an int type integer's internal code is a 32-bit $01$ sequence. Some of these $01$ sequences are symmetric, while others are not.
For a given integer, we need to determine whether its internal code is symmetric in certain situations.

Input Format

A single line containing an integer $n$.

Output Format

If the internal code of $n$ is symmetric, output "YES"; otherwise, output "NO".

Sample

2147483646

YES