Problems
None of the two conditions
None of the two conditions
For the given integer n print "YES", if none of the next conditions takes place and "NO" otherwise.
number n is even and positive;
number n is odd and negative.
Input data
One integer n.
Output data
Print "YES" or "NO" depending on conditions.
Examples
Input example #1
7
Output example #1
YES
Input example #2
24
Output example #2
NO