#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
#include<queue>
#include<cmath>
#define INF 0x3f3f3f3f
using namespace std;

const int maxn=200+10;
double dis[maxn],gra[maxn][maxn];
bool vis[maxn];
int cal;

struct Point
{
    int x,y;
}point[maxn];

queue<int>Q;

double caldistance(Point a,Point b)
{
    return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
}


void Spfa()
{
    while(!Q.empty())  Q.pop();
    for(int i=1;i<=cal;i++)
    {
        dis[i]=INF*1.0;
        vis[i]=false;
    }
    dis[1]=0;
    vis[1]=true;
    Q.push(1);
    while (!Q.empty())
    {
        int temp=Q.front();
        Q.pop();
        vis[temp]=false;
        for(int i=1;i<=cal;i++)
        {
            if (dis[temp]+gra[temp][i]<dis[i])
            {
                dis[i]=dis[temp]+gra[temp][i];
                if(!vis[i])
                {
                    Q.push(i);
                    vis[i]=true;
                }
            }
        }
    }
}

int main()
{
    int u,v;
    int last_point;
    double v1=40000.0/60;
    double v2=10000.0/60;
    while(~scanf("%d%d%d%d",&point[1].x,&point[1].y,&point[2].x,&point[2].y))
    {
        cal=2,last_point=-1;
        memset(gra,0,sizeof(gra));
        while(scanf("%d%d",&u,&v)==2)
        {
            if(u==-1&&v==-1)
            {
                last_point=-1;
                continue;
            }
            if(last_point==-1)
            {
                point[++cal].x=u,
                point[cal].y=v;
                last_point=cal;
            }
            else
            {
                point[++cal].x=u;
                point[cal].y=v;
                gra[last_point][cal]=gra[cal][last_point]=caldistance(point[last_point],point[cal])/v1;
                last_point=cal;
            }
        }
        for(int i=1;i<cal;i++)
            for(int j=i+1;j<=cal;j++)
                if(gra[i][j]==0)
                        gra[i][j]=gra[j][i]=caldistance(point[i],point[j])/v2;
        Spfa();
        printf("%d\n",int(dis[2]+0.5));//四捨五入
    }
    return 0;
}