Decide whether n is an exact power of two (1, 2, 4, 8, 16, ...).
One line: a positive integer n.
Print YES if n is a power of two, otherwise NO.
Example 1
Input
16
Expected
YES
Explanation
16 = 2^4 is a power of two, so YES.
Example 2
Input
6
Expected
NO
Explanation
6 = 2*3 is not a power of two, so NO.
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