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");
}
}
}