#include<bits/stdc++.h>  
using namespace std;
int n,m,k,x1,y1,x2,y2,z[110][110],i,j,t;
int main(){
	scanf("%d%d%d",&n,&m,&k);
	for(i=1;i<=m;i++){
		scanf("%d%d",&x1,&y1); 
		z[x1][y1]=1;z[x1][y1+1]=1;z[x1][y1+2]=1;z[x1][y1-1]=1;z[x1][y1-2]=1;z[x1+1][y1]=1;z[x1+2][y1]=1;z[x1-1][y1]=1;z[x1-2][y1]=1;z[x1-1][y1-1]=1;z[x1-1][y1+1]=1;z[x1+1][y1-1]=1;z[x1+1][y1+1]=1;
	}
	for(i=1;i<=k;i++){
		scanf("%d%d",&x2,&y2);
		z[x2][y2]=1;z[x2][y2+1]=1;z[x2][y2+2]=1;z[x2][y2-1]=1;z[x2][y2-2]=1;z[x2+1][y2]=1;z[x2+2][y2]=1;z[x2-1][y2]=1;z[x2-2][y2]=1;z[x2-1][y2-1]=1;z[x2-1][y2+1]=1;z[x2+1][y2-1]=1;z[x2+1][y2+1]=1;z[x2-1][y2-2]=1;z[x2-2][y2-2]=1;z[x2-2][y2-1]=1;z[x2+2][y2+1]=1;z[x2+2][y2+2]=1;z[x2+1][y2+2]=1;z[x2-2][y2+1]=1;z[x2-2][y2+2]=1;z[x2-1][y2+2]=1;z[x2+2][y2-1]=1;z[x2+2][y2-2]=1;z[x2+1][y2-2]=1;
	}
	for(i=1;i<=n;i++){
		for(j=1;j<=n;j++){
			if(z[i][j]==0){
				t++;
			}
		}
	}
	printf("%d",t);
}