#include <iostream>
#include <fstream>
using namespace std;

#define INF 1000000

struct point{
	int group;
	int x,y;
	void print(){
		cout<<"point=("<<x<<" "<<y<<" "<<group<<") ";
	}
};
point p[1010];
double dis[1010][1010];
int pn;


double getdis(int a,int b){
	double distance;
	if(p[a].group!=p[b].group||p[a].group==p[b].group&&p[a].group==0){
		distance=(double)(abs(p[a].x-p[b].x)+abs(p[a].y-p[b].y));
	}else{
		int tmp=abs(p[a].x-p[b].x)+abs(p[a].y-p[b].y);
		distance=(double)tmp/4;
	}
//	p[a].print();p[b].print();
//	cout<<"dis="<<distance;
//	cout<<endl;
	return distance;
}


void main(){
	ifstream cin("data.txt");
	pn=0;
	cin>>p[0].x>>p[0].y>>p[1].x>>p[1].y;
	p[0].group=0;p[1].group=0;
	pn=2;
	int x,y,i,j,k;
	int group=1;
	
	while(cin>>x>>y){
		if(x==-1&&y==-1){	
			group++;
			continue;
		}
		p[pn].x=x;p[pn].y=y;
		p[pn].group=group;
		pn++;
	}
	
	for(i=0;i<pn;i++){
		for(j=0;j<pn;j++){
			if(i==j)dis[i][j]=0;
			else dis[i][j]=INF;

		}
	}
	for(i=0;i<pn;i++){
		for(j=i+1;j<pn;j++){
			int gap=getdis(i,j);
			dis[i][j]=gap;
			dis[j][i]=gap;
		}
	}
	for(k=0;k<pn;k++){
		for(i=0;i<pn;i++){
			for(j=0;j<pn;j++){
				if(dis[i][j]>dis[i][k]+dis[k][j])dis[i][j]=dis[i][k]+dis[k][j];
			}
		}
	}
	double time=(double)dis[0][1]/1000*6;
	int tmpn=(int)time;
	if(time-tmpn>0.5)cout<<tmpn+1<<endl;
	else cout<<tmpn<<endl;

}