#include<stdio.h>
int main()
{
char a;
scanf("%c",&a);
if(a%2==1) printf("YES\n");
else printf("NO\n");
return 0;
}

#include<iostream>
using namespace std;
int main()
{
char a;
cin>>a;
if(a%2==0)
cout<<"NO"<<endl;
else
cout<<"YES"<<endl;
return 0;
}
//简单明了