#include <iostream>
#include <string>
using namespace std;

int main() {
    int N;
    cin >> N;
    if (N == string("a").size()) {
        cout << "NO" << endl;
        return 0;
    }
    bool flg = true;
    int divisor = string("aa").size();
    if (N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaaaaaaaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    divisor = string("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").size();
    if (flg && N != divisor && N % divisor == 0) flg = false;
    if (flg && N > string("a").size()) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}