import java.util.*;
import java.io.*;

class Box {
    public int w, h, x, y;

    Box (int a, int b, int c, int d){
	w = a; h = b; x = c; y = d;
    }
}

public class Main {
    int width;
    int height;
    ArrayList boxes;
    Box arr[];
    int partx[], party[];

    public int calc(){
	int area = 0;
	for (int i = 0; i < partx.length - 1; i++){
	    for (int j = 0; j < party.length - 1; j++){
		int x1 = partx[i], x2 = partx[i+1];
		int y1 = party[j], y2 = party[j+1];

		boolean contained = false;
		for (int m = 0; !contained && m < arr.length; m++){
		    if (x1 >= arr[m].x && x2 <= arr[m].x + arr[m].w &&
			y1 >= arr[m].y && y2 <= arr[m].y + arr[m].h){
			contained = true;
		    }
		}

		if (!contained) area += (x2 - x1) * (y2 - y1);
	    }
	}
	return area;
    }

    public int doit(){
	ArrayList px = new ArrayList();
	ArrayList py = new ArrayList();
	
	px.add (new Integer(0)); px.add (new Integer (width));
	py.add (new Integer(0)); py.add (new Integer (height));
	for (int i = 0; i < arr.length; i++){
	    Integer j = new Integer (arr[i].x);
	    Integer k = new Integer (arr[i].y);

	    if (!px.contains (j)) px.add (j);
	    if (!py.contains (k)) py.add (k);

	    j = new Integer (arr[i].x + arr[i].w);
	    k = new Integer (arr[i].y + arr[i].h);

	    if (!px.contains (j)) px.add (j);
	    if (!py.contains (k)) py.add (k);
	}

	Collections.sort (px);
	Collections.sort (py);
	
	partx = new int[px.size()];
	party = new int[py.size()];
	for (int i = 0; i < partx.length; i++) partx[i] = ((Integer) px.get(i)).intValue();
	for (int i = 0; i < party.length; i++) party[i] = ((Integer) py.get(i)).intValue();
	
	return calc();
    }

    public void run(){
	try {
	    BufferedReader br = new BufferedReader (new InputStreamReader (System.in));
	    String s;
	    while ((s = br.readLine()) != null){
		StringTokenizer st = new StringTokenizer (s);
		width = Integer.parseInt (st.nextToken());
		height = Integer.parseInt (st.nextToken());
		
		boxes = new ArrayList();
		while ((s = br.readLine()) != null){
		    int a, b, c, d;
		    StringTokenizer st2 = new StringTokenizer (s);
		    a = Integer.parseInt (st2.nextToken());
		    b = Integer.parseInt (st2.nextToken());
		    c = Integer.parseInt (st2.nextToken());
		    d = Integer.parseInt (st2.nextToken());
		    if (a == 0 && b == 0 && c == 0 && d == 0) break;
		    boxes.add (new Box (a,b,c,d));
		}
		
		arr = (Box[]) boxes.toArray(new Box[0]);
		System.out.println ("Floor has " + doit() + " area not covered");
	    }

	    br.close();
	}
	catch (Exception e){
	    e.printStackTrace();
	}
    }

    public static void main (String args[]){
	new Main().run();
    }
}