#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(a) a.begin(), a.end()
#define P pair<int, int>
#define F first
#define S second
#define INF 1e18
#define MOD 998244353
int iso_lower(vector<int> V, int x) {
    //ソートされたVの中から、V[i]>=xとなる最小のiを返す.存在しなければVの要素数を返す
    int s = V.size();
    //V.push_back(INF);
    int l = -1;
    int r = s;  //rが常にtrue
    while(r - l > 1) {
        int mid = (l + r) / 2;
        if(V[mid] < x)
            l = mid;
        else
            r = mid;
    }
    return r;
}
signed main(){
    int A;cin>>A;
    if(A==1)cout<<"NO"<<endl;
    else cout<<"YES"<<endl;
}