#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n%2!=0)
    {
        cout<<"yes";
    }
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a; cin>>a; if(a%2!=0){ cout<<"yes";} else{ cout<<"";} }

#include<bits/stdc++.h> using namespace std; int main() { int a; cin>>a; if(a%2!=0){ cout<<"yes";} else{ cout<<" ";} }