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