#include <bits/stdc++.h>
using namespace std;
int n,m,k,x,y,ans;
int a[110][110] = {0};
int main(){
	cin>>n>>m>>k;
	for(int i=1;i<=m;i++){
		cin>>x>>y;
		for(int j=x-2;j<=x+2;j++)
			a[j][y] = 1;
		for(int j=y-2;j<=y+2;j++)
			a[x][j] = 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;
		for(int j=x-2;j<=x+2;j++)
			for(int k=y-2;k<=y+2;k++)
				a[j][k] = 1;
	}
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++)
			if(a[i][j] == 0)ans++;
	cout<<ans<<endl;
	return 0;
}