import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        if(n%2 != 0){
            System.out.println("YES");
        }else {
            System.out.println("NO");
        }
        sc.close();
    }
}