/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.10.16 21:54:35
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int a;cin >> a;
    if (a != 1) {
        puts("YES");
    }
    else {
        puts("NO");
    }
    return 0;
}