#include <stdio.h>
#include<algorithm>
#include<math.h>
#include<iostream>
using namespace std;

int pp[1010][1010];

int main() {
	
	int ans = 0;
	int sum = 0;
	int n, huo, ying, x, y, q, s;
	cin >> n >> huo >> ying;
	for(int i = 0; i < huo; i++){
		cin >> x >> y;
		pp[x][y] = 1;
		pp[x][y - 1] = 1;
		pp[x][y - 2] = 1;
		pp[x][y + 1] = 1;
		pp[x][y + 2] = 1;
		pp[x - 1][y - 1] = 1;
		pp[x + 1][y - 1] = 1;
		pp[x - 2][y] = 1;
		pp[x - 1][y] = 1;
		pp[x + 1][y] = 1;
		pp[x + 2][y] = 1;
		pp[x - 1][y + 1] = 1;
		pp[x + 1][y + 1] = 1;
	}
	for(int i = 0; i < ying; i++){
		cin >> q >> s;
		pp[q][s] = 1;
		pp[q][s - 1] = 1;
		pp[q][s - 2] = 1;
		pp[q][s + 1] = 1;
		pp[q][s + 2] = 1;
		pp[q - 1][s - 2] = 1;
		pp[q - 2][s - 2] = 1;
		pp[q + 1][s - 2] = 1;
		pp[q + 2][s - 2] = 1;
		pp[q - 1][s - 1] = 1;
		pp[q - 2][s - 1] = 1;
		pp[q + 1][s - 1] = 1;
		pp[q + 2][s - 1] = 1;
		pp[q - 1][s] = 1;
		pp[q - 2][s] = 1;
		pp[q + 1][s] = 1;
		pp[q + 2][s] = 1;
		pp[q - 1][s + 1] = 1;
		pp[q - 2][s + 1] = 1;
		pp[q + 1][s + 1] = 1;
		pp[q + 2][s + 1] = 1;
		pp[q - 1][s + 2] = 1;
		pp[q - 2][s + 2] = 1;
		pp[q + 1][s + 2] = 1;
		pp[q + 2][s + 2] = 1;
	} 
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(pp[i][j] != 1){
				ans++;
			}
		}
	}
	cout << ans << endl;
	

	return 0;
}