#include<bits/stdc++.h>
using namespace std;
bool mm[22000][22000];
int k,m,n,ans;
int main()
{
	cin>>n>>m>>k;
	for(int i=1;i<=m;i++)
	{
		int x,y;
		scanf("%d %d",&x,&y);
		mm[x][y]=1;
		mm[x-2][y]=1;
		mm[x-1][y]=1;
		mm[x][y-2]=1;
		mm[x][y-1]=1;
		mm[x][y+1]=1;
		mm[x][y+2]=1;
		mm[x+1][y]=1;
		mm[x+2][y]=1;
		mm[x-1][y-1]=1;
		mm[x-1][y+1]=1;
		mm[x+1][y-1]=1;
		mm[x+1][y+1]=1;
	}
	for(int i=1;i<=k;i++)
	{
		int x,y;
		cin>>x>>y;
		mm[x][y]=1;
		mm[x-2][y]=1;
		mm[x-1][y]=1;
		mm[x][y-2]=1;
		mm[x][y-1]=1;
		mm[x][y+1]=1;
		mm[x][y+2]=1;
		mm[x+1][y]=1;
		mm[x+2][y]=1;
		mm[x-1][y-1]=1;
		mm[x-1][y+1]=1;
		mm[x+1][y-1]=1;
		mm[x+1][y+1]=1;
		mm[x-2][y-2]=1;
		mm[x-2][y-1]=1;
		mm[x-2][y+1]=1;
		mm[x-2][y+2]=1;
		mm[x-1][y-2]=1;
		mm[x-1][y+2]=1;
		mm[x+1][y-2]=1;
		mm[x+1][y+2]=1;
		mm[x+2][y-2]=1;
		mm[x+2][y-1]=1;
		mm[x+2][y+1]=1;
		mm[x+2][y+2]=1;
	}
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			if(mm[i][j]==0) ans++;
		}
	}
	cout<<ans;
	return 0;
}

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