#include <stdio.h>
short n,m,vis[41][41],sum,sx,sy,fx,fy,zhx,zhy,t;
short a[51][51],dx[]={1,-1,0,0};
short dy[]={0,0,1,-1};
void f(int x,int y){
if(xfx&&yfy){
sum++;
return;
}
vis[x][y]=1;
for(int i=0;i<4;i++){
int nx=x+dx[i];
int ny=y+dy[i];
if(vis[nx][ny])continue;
if(nx<1||nx>n||ny<1||ny>m){
continue;
}
if(a[nx][ny]==1){
continue;
}
f(nx,ny);
}
vis[x][y]=0;
}
int main(){
scanf("%hd %hd %hd",&n,&m,&t);
scanf("%hd %hd %hd %hd",&sx,&sy,&fx,&fy);
for(int j=1;j<=t;j++){
scanf("%hd %hd",&zhx,&zhy);
a[zhx][zhy]=1;
}
f(sx,sy);
printf("%hd",sum);
}
