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

#include <stdio.h>
#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;
int main()
{
	char a;
	cin>>a;
	if(a%2==1)
	{
		cout<<"YES";
	}
	else
	{
		cout<<"NO";
	}
}