import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		long N = scan.nextLong();
		scan.close();
		if(isPrime(N)) {
			System.out.println("NO");
		}else {
			System.out.println("YES");
		}

	}
	public static boolean isPrime(long n) {
	    if (n < 2) return false;
	    else if (n == 2) return true;
	    else if (n % 2 == 0) return false;

	    for (long i = 3; i < n; i += 2) {
	        if (n % i == 0) {
	            return false;
	        }
	    }

	    return true;
	}
}