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#include <queue>
#include <iostream>
#include <vector>
#include <cstring>
#include <iostream>
//#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    cin>>n;
    vector < pair<int,int> > v;
    int x,y;
    for(int i=0;i<n;i++)
    {
        cin>>x>>y;
        v.push_back(make_pair(x,y));
    }
    vector < pair<int, double> > g[n];

vector<bool> visited(n,false);
    vector<double> dis(n,-2e9);
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
            double d=sqrt(((v[j].first-v[i].first) * (v[j].first-v[i].first))+((v[j].second-v[i].second)*(v[j].second-v[i].second)));
            if(d<=10)
                g[i].push_back(make_pair(j,-d));
        }
    }
    dis[0]=0;
    priority_queue<pair<double, int> > pq;
    pq.push(make_pair(0,0));

while(!pq.empty())
    {
        pair<double, int> c=pq.top();

pq.pop();

if(visited[c.second])
        {
            continue;
        }
        visited[c.second]=true;
        for(int i=0;i<g[c.second].size();i++)
        {
            int s=g[c.second][i].first;
            double t=g[c.second][i].second;

if(!visited[s] && c.first+t>dis[s])
            {
                pq.push(make_pair(c.first+t, s));
                dis[s]=c.first+t;
            }
        }
    }
    cout<<-dis[n-1]<<endl;
    return 0;
}