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

One integer **n**.

#### Output

Print **YES** or **NO** depending on conditions.

Input example #1

7

Output example #1

YES

Input example #2

24

Output example #2

NO