#include<bits/stdc++.h>
using namespace std;
int a[1005][1005];
void light1(int x,int y){
	//int x=o-1,y=p-1;
	a[x][y]=1;
	if(x+1>=1)a[x+1][y]=1;
	if(x+2>=1)a[x+2][y]=1;
	if(x-1>=1)a[x-1][y]=1;
	if(x-2>=1)a[x-2][y]=1;
	if(y+1>=1)a[x][y+1]=1;
	if(y+2>=1)a[x][y+2]=1;
	if(y-1>=1)a[x][y-1]=1;
	if(y-2>=1)a[x][y-2]=1;
	if(x+1>=1&&y+1>=1)a[x+1][y+1]=1;
	if(x+1>=1&&y-1>=1)a[x+1][y-1]=1;
	if(x-1>=1&&y+1>=1)a[x-1][y+1]=1;
	if(x-1>=1&&y-1>=1)a[x-1][y-1]=1;
}
void light2(int o,int p){
	int x=o-1,y=p-1;
	for(int i=x-2;i<=x+2;i++){
		if(i>=0){
			for(int j=y-2;i<=y+2;j++){
				if(j>=0){
					a[i][j]=1;
				}
			}
		}
	}
}
int main(){
	int n,m,k,cnt=0;
	cin>>n>>m>>k;
	for(int i=0;i<m;i++){
		int x,y;
		cin>>x>>y;
		light1(x,y);
	}
	for(int i=0;i<k;i++){
		int x,y;
		cin>>x>>y;
		light2(x,y);
	} 
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			if(a[i][j]==0)cnt++;
			//cout<<a[i][j]<<" ";
		}
		//cout<<endl;
	}
	cout<<cnt;
    return 0;
}