#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using namespace std;

int main()
{
    int a;
    cin >> a;
    
    cout <<((a != 1) ? "YES" : "NO") << endl;
}