import java.util.TreeMap;

public class Task061125 {
    public static void main(String[] args) {
        TreeMap<Integer, String> map = new TreeMap<>();
        map.put(1, "one");
        map.put(3, "three");
        map.put(5, "five");
        map.put(7, "seven");
        
        System.out.print(map.lowerKey(4) + " ");
        System.out.print(map.floorKey(4) + " ");
        System.out.print(map.higherKey(4) + " ");
        System.out.print(map.ceilingKey(4));
    }
}