#include<stdio.h>
int main() {
	int i,j,c,b,q=0,n,m,k,x,y;
	int a[100][100]= {0};
	scanf("%d%d%d\n",&n,&m,&k);
	for(i=2; i<=m+1; i++) {
		scanf("%d%d\n",&x,&y);
		a[x+2][y]=1;
		a[x+1][y]=1;
		a[x-2][y]=1;
		a[x-1][y]=1;
		a[x+1][y-1]=1;
		a[x+1][y+1]=1;
		a[x-1][y-1]=1;
		a[x-1][y+1]=1;
		a[x][y-2]=1;
		a[x][y-1]=1;
		a[x][y+1]=1;
		a[x][y+1]=1;
	}
	for(j=m+2; j<=m+k+1; j++) {
		scanf("%d%d\n",&x,&y);
		for(c=x-2; c<=x+2; c++) {
			for(b=y-2; b<=y+2; b++) {
				a[x][y]=1;
			}
			printf("\n");

		}
	}
	for(x=1; i<=n; i++) {
		for(y=1; j<=n; j++) {
			if(a[x][y]=0)
				q++;
		}

	}
	printf("%d",&q);
	return 0;
}