#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a[n][n];
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			a[i][j]=0;
		}
	}
	int h,y;
	cin>>h>>y;
	for(int i=0;i<h;i++){
		int x,y;
		cin>>x>>y;
		x--;
		y--;
		a[x][y]=1;
		a[x-1][y]=1;
		a[x-2][y]=1;
		a[x+1][y]=1;
		a[x+2][y]=1;
		a[x][y-2]=1;
		a[x][y-1]=1;
		a[x][y+2]=1;
		a[x][y+1]=1;
		a[x-1][y+1]=1;
		a[x-1][y-1]=1;
		if(y>=1){
			a[x+1][y-1]=1;
		}
		
		a[x+1][y+1]=1;
	}
	for(int i=0;i<y;i++){
		int x,y;
		cin>>x>>y;
		x--;
		y--;
		for(int i=x-2;i<=x+2;i++){
			for(int j=y-2;j<=y+2;j++){
				if(i>=0&&j>=0)
					a[i][j]=1;
			}			
		}
	}
	int s=0;
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			//cout<<a[i][j];
			if(a[i][j]==0){
				s++;
			}
		}
		//cout<<endl;
	}	
	cout<<s;
	return 0;
}