#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	char a;
	cin >> a;
	if(int(a) % 2 == 0)
		cout << "NO" << endl;
	else
		cout << "YES" << endl;
//	cout << fixed << setprecision(3) << x * 100 << "%" << endl;
//	return 0;
}

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    char n;
    scanf("%c",&n);
    if(n%2==0)printf("NO\n");
      else printf("YES\n"); 
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
bool ascll(char a){
   return int(a)%2;}
char a;
int main(){
   scanf("%c",&a);
   if(ascll(a)) cout<<"YES";
   else cout<<"NO";
   return 0;
}

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

#include using namespace std; int main(){ char a; cin>>a; int n=a; if(n%20)cout<<"NO"<<endl; if(n%21)cout<<"YES"<<endl; }

#include <bits/stdc++.h>
using namespace std;
int main(int argc, char **argv){
	char c;
	cin >> c;
	int a = (int)c;
	if (a % 2 != 0){
		cout << "YES";
	}else {
		cout << "NO";
	}
	return 0;
}

#include<bits/stdc++.h>
#define ll long long
using namespace std;
char a;
int main(){
	cin>>a;
	if(int(a)%2) cout<<"YES"<<"\n";
	else cout<<"NO"<<"\n";
	return 0;
}