import java.util.List;
import java.util.ArrayList;
 
/**
 * Created by IntelliJ IDEA.
 * User: me
 * Date: 11.09.2006
 * Time: 15:16:20
 * To change this template use File | Settings | File Templates.
 */
public class Polygon {
    private List vertices = new ArrayList();
 
    public void add(Point p) {
        vertices.add(p);
    }
 
    public void remove(Point p) {
        vertices.remove(p);
    }
 
    public int numVertices() {
        return vertices.size();
    }
}
 
class Point {
    private int x = 0, y = 0;
 
    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
 
    public int getX() {
        return x;
    }
 
    public void setX(int x) {
        this.x = x;
    }
 
    public int getY() {
        return y;
    }
 
    public void setY(int y) {
        this.y = y;
    }
}