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);
        int n  = in.nextInt();
        if (n % 2 == 0 || n > 50) {
            System.out.println("yes");
        } else {
            System.out.println("no");  
        }
    }
}