import java.util.Collections;
import java.util.HashSet;
public class Main {
public static void main(String[] args) {
HashSet hashSet = new HashSet();
hashSet.add(new Long("1111111111"));
hashSet.add(new Long("2222222222"));
hashSet.add(new Long("3333333333"));
hashSet.add(new Long("4444444444"));
hashSet.add(new Long("5555555555"));
Object obj = Collections.max(hashSet);
System.out.println(obj);
}
}