package LanQiaoOJ;

import java.util.Scanner;

public class 确定一个数是否为2的幂 {

	public static void main(String[] args) {
		/*System.out.println(Integer.toString(2,2));
		System.out.println(Integer.toString(4,2));
		System.out.println(Integer.toString(6,2));
		System.out.println(Integer.toString(8,2));
		System.out.println(Integer.toString(16,2));
		System.out.println(Integer.toString(32,2));*/
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		if(n==1) {
			System.out.print("NO");
			return;
		}
		System.out.print(Integer.bitCount(n)==1?"YES":"NO");
	}

}