#include<iostream>
using namespace std;
bool a[10000][10000];
int main() 
{
	int n, m, k;
	int x, y, s = 0;
	cin >> n >> m >> k;
	for (int i = 1; i <= m; i++) 
	{
		cin >> x >> y;
		a[x][y] = 1;
		a[x - 1][y] = 1;
		a[x - 2][y] = 1;
		a[x + 1][y] = 1;
		a[x + 2][y] = 1;
		a[x][y - 1] = 1;
		a[x][y - 2] = 1;
		a[x][y + 1] = 1;
		a[x][y + 2] = 1;
		a[x - 1][y - 1] = 1;
		a[x - 1][y + 1] = 1;
		a[x + 1][y - 1] = 1;
		a[x + 1][y + 1] = 1;
	}
	for (int i = 1; i <= k; i++) 
	{
		cin >> x >> y;
		a[x][y] = 1;
		a[x][y - 1] = 1;
		a[x][y - 2] = 1;
		a[x][y + 1] = 1;
		a[x][y + 2] = 1;
		a[x - 1][y] = 1;
		a[x - 2][y] = 1;
		a[x + 1][y] = 1;
		a[x + 2][y] = 1;
		a[x - 1][y + 1] = 1;
		a[x - 1][y - 1] = 1;
		a[x - 1][y - 2] = 1;
		a[x - 1][y + 2] = 1;
		a[x + 1][y - 1] = 1;
		a[x + 1][y + 1] = 1;
		a[x + 1][y + 2] = 1;
		a[x + 1][y - 2] = 1;
		a[x - 2][y - 2] = 1;
		a[x - 2][y - 1] = 1;
		a[x - 2][y + 1] = 1;
		a[x - 2][y + 2] = 1;
		a[x + 2][y + 2] = 1;
		a[x + 2][y + 1] = 1;
		a[x + 2][y - 1] = 1;
		a[x + 2][y - 2] = 1;
	}
	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			if (a[i][j] == 0)
			{
				s++;
			}
		}
	}
	cout << s;
	return 0;
}