import java.util.HashSet;
import java.util.Iterator;
public class Main {
public static void main(String[] args) {
HashSet hSet = new HashSet();
hSet.add(new Integer("1"));
hSet.add(new Integer("2"));
hSet.add(new Integer("3"));
Iterator itr = hSet.iterator();
while (itr.hasNext())
System.out.println(itr.next());
}
}