#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

int main() {
    int N;
    cin >> N;

    if (N < string("aa").size()) {
        cout << "NO" << endl;
        exit(EXIT_SUCCESS);
    }

    string s = "aa";
    bool is_prime = true;
    while (s.size() < N) {
        if (N % s.size() == 0) {
            is_prime = false;
            break;
        }
        s.append(1, 'a');
    }

    if (is_prime) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }

    exit(EXIT_SUCCESS);
}