Poj Solution 3372

http://poj.org/problem?id=3372

//* @author: 82638882@163.com<br />
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 */

import java.util.Scanner;
public class Main
{
 public static void main(String[] args)
 {
    Scanner in=new Scanner(System.in);
    
    while(in.hasNext())
    {
        int a=in.nextInt();
        while(a%2==0)
            a=a/2;
        if(a==1) System.out.println("YES");
        else System.out.println("NO");
    }
  }
}