27.Main

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;


public class Main {
    public static void main(String[] args) {

    Map<Integer, Set<People>> mapa = new HashMap<Integer, Set<People>>();
    Set<People> wiek = new HashSet<People>();

    }
}