#include <bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
const int MOD =  1000000007;
const int INF = 1e17;
using Graph = vector<vector<int>>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

signed main(){
  int N;
  cin >> N;
  if( N == 1 ) cout << "NO" << endl;
  else cout << "YES" << endl;

}