#include<bits/stdc++.h>
using namespace std;
char n;
int m;
int main(){
    cin >> n;
    m=n;
    m=m%2;
    if(m==1)
    cout<<"YES";
    if(m==0)
    cout<<"NO";
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main(){ char a; cin>>a; a=int(a); if(a%21) { cout<<"YES"; } if(a%20) { cout<<"NO"; } return 0; }