import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No036 {

    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            long N = Long.parseLong(br.readLine());
            if (N == 1 || isPrime(N)) {
                System.out.println("NO");
            } else {
                System.out.println("YES");
            }
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

    // エラトステネスの篩
    // 素数とかわかる
    static boolean isPrime(long n) {

        if (n < 2) {
            return false;
        } else if (n == 2) {
            return true;
        }
        if (n % 2 == 0) {
            return false;
        }
        for (int i = 3; i * i <= n; i += 2) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;

    }
}