#include <iostream>
using namespace std;
int main()
{
char c;
cin>>c;
if(c%2==1) cout<<"YES";
else cout<<"NO";
return 0;
}
#include <iostream>
using namespace std;
int main()
{
char c;
cin>>c;
if(c%2==1) cout<<"YES";
else cout<<"NO";
return 0;
}