import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.imageio.ImageIO;

public class C0169_Hard2 {

    private static Vertex[] vertices;

    private static int SIZE = 2000;
    private static BufferedImage image = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_RGB);
    private static File file = new File("Polygon.txt");

    public static void main(String[] args) {
        readFromFile();
        draw(vertices);
        saveToFile();
        System.out.println(getPixels());
    }

    private static int getPixels(){
        int count = 0;
        for(int i = 0; i < image.getWidth(); i++){
            for(int j = 0; j < image.getHeight(); j++){
                Color c = new Color(image.getRGB(j, i));
                if(c.getRed() > 10){
                    count++;
                }
            }
        }
        return count;
    }

    private static void draw(Vertex[] v){
        Graphics2D graphics = image.createGraphics();
        drawPolygon(v, graphics);
    }

    private static void drawPolygon(Vertex[] v, Graphics2D g){
        int[] xPoints = new int[v.length];
        int[] yPoints = new int[v.length];
        for(int i = 0; i < xPoints.length; i++){
                xPoints[i] = ((int)v[i].x)*SIZE/10;
                yPoints[i] = ((int)v[i].y)*SIZE/10;
        }
        Polygon p = new Polygon(xPoints, yPoints, v.length);
        g.drawPolygon(p);
        g.fillPolygon(p);
    }

    private static void saveToFile(){
        File outputFile = new File("poly.png");
        try {
            ImageIO.write(image, "png", outputFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void readFromFile(){
        try{
            BufferedReader buffRead = new BufferedReader(new FileReader(file));
            String line = buffRead.readLine();
            int count = -1;
            while(line != null){
                if(count == -1) vertices = new Vertex[Integer.parseInt(line)+1];
                else            vertices[count] = new Vertex(line);
                count++;
                line = buffRead.readLine();
            }
            vertices[vertices.length-1] = new Vertex(vertices[0].x, vertices[0].x);
            buffRead.close();
        } catch(IOException e){
            e.printStackTrace();
        }
    }

}