#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

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

	return 0;
}