package Course_Codes;

import java.util.Scanner;

//判断一个整数n是否为2^x
public class _2的幂的判断 {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			int n=sc.nextInt();
			System.out.println((n&(n-1))==0?"YES":"NO");
		}
	}
}