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 in = new Scanner(System.in); long num = in.nextLong(); if(num%2==0){ System.out.println("NO"); } else{ System.out.println("YES"); } in.close(); } }