#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll a;
    cin >> a;
    cout << (a == 1 ? "NO" : "YES") << newl;

    return 0;
}