Competitions

# 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.

One integer n.

#### Output

Print YES or NO depending on conditions.

Time limit 1 second
Memory limit 128 MiB
Input example #1
7

Output example #1
YES

Input example #2
24

Output example #2
NO

Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"