// g++ B.cpp && ./a.out
#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, a, b) for (int i = a; i < (int)(b); i++)
#define all(v) v.begin(), v.end()
using ll = long long;
const ll INF = 1e18;
// 変数定義
ll ans, cnt, N, a, n, m;
int main()
{
  cin >> N;
  if (N == 1)
  {
    cout << "NO" << endl;
  }
  else
  {
    cout << "YES" << endl;
  }
  return 0;
}