import java.util.Scanner;
import java.util.ArrayList;
import java.lang.Math;
public class classestemplate
{
  private static final int PARTNER = 0;
  private static final int MOTHER = 1;
  private static final int FATHER = 2;
  private static final int NAME = 3;
  private static final int PERSON_SIZE = 4;
  private static ArrayList<int[]> persons = new ArrayList<int[]>();
  private static ArrayList<String> names = new ArrayList<String>();
  public static void main(String[] args)
  {
    // Meet Bob!
	int[] bob = new int[PERSON_SIZE];
	bob[MOTHER] = -1; // Bob's mother is not in this program
	bob[FATHER] = -1; // Bob's father is not in this program
	int bobsIndex = persons.size(); // Find Bob's index number
	persons.add(bob); // Register Bob
	bob[NAME] = names.size(); // Find Bob's name's index number
	names.add("Bob");
	
	// Meet Mary!
	int[] mary = new int[PERSON_SIZE];
	mary[MOTHER] = -1; // Mary's mother is not in this program
	mary[FATHER] = -1; // Mary's father is not in this program
	int marysIndex = persons.size(); // Find Mary's index number
	persons.add(mary); // Register Mary
	mary[NAME] = names.size(); // Find Mary's name's index number
	names.add("Mary");
	
	// Bob and Mary are married!
	bob[PARTNER] = marysIndex;
	mary[PARTNER] = bobIndex;
	
    // Meet their child Tim!
	int[] tim = new int[PERSON_SIZE];
	tim[PARTNER] = -1; // Tim is not married
	tim[MOTHER] = marysIndex;
	tim[FATHER] = bobIndex;
	int timsIndex = persons.size(); // Find Tim's index number
	persons.add(tim); // Register Tim
	tim[NAME] = names.size(); // Find Tims's name's index number
	names.add("Tim");
	
	// If we want Tim's mother, we do this:
	int[] timsMother = persons[tim[MOTHER]];
	// If we want her partner, we do this:
	int[] timsMothersPartner = persons[timsMother[PARTNER]];
	// Note that timsMother == mary and timsMothersPartner == bob
	
	string timsMothersName = names[timsMother[NAME]];
	string timsMothersPartnersName = names[timsMothersPartner[NAME]];
	
	// Remember to check for -1 entries
  }
}