#include<bits/stdc++.h>
using namespace std;
int a[20000][20000];
bool yj(int x,int y,int n){
	if(x<1||y<1||x>n||y>n) return false;
	else return true;
}
int main(){
	int n,m,k;
	cin>>n>>m>>k;
	for(int i=1;i<=m;i++){
		int x,y;
		cin>>x>>y;
		if(!yj(x,y,n)) continue;
		a[x][y-2]=1;
		a[x-1][y-1]=1;
		a[x][y-1]=1;
		a[x+1][y-1]=1;
		a[x-2][y]=1;
		a[x-1][y]=1;
		a[x][y]=1;
		a[x+1][y]=1;
		a[x+2][y]=1;
		a[x-1][y+1]=1;
		a[x][y+1]=1;
		a[x+1][y+1]=1;
		a[x][y+2]=1;
	}
	for(int i=1;i<=k;i++){
		int x,y;
		cin>>x>>y;
		if(!yj(x,y,n)) continue;
		for(int j=y-2;j<=y+2;j++){
			a[x-2][j]=1;
			a[x-1][j]=1;
			a[x][j]=1;
			a[x+1][j]=1;
			a[x+2][j]=1;
		}
	}
	int cnt=0;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			if(a[i][j]==0){
				cnt++;
			}
		}
	}
	cout<<cnt;
	return 0;
}