#include <algorithm>
#include <bitset>
#include <climits>
#include <cmath>
#include <cstdio>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
#define REP(var, a, b) for (int var = (a); var < (b); var++)
#define rep(var, n) for (int var = 0; var < (n); ++var)
#define ALL(c) (c).begin(), (c).end()
#define rALL(c) (c).rbegin(), (c).rend()
ll MOD = 1000000007;
ll INF = 1e18;

struct edge {
  ll to, cost;
  edge(ll t, ll c) : to(t), cost(c) {}
};

class Dijkstra {
 private:
  ll n_;
  vector<vector<edge>> G_;
  vl d_;

 public:
  Dijkstra(ll n) : n_(n), G_(n), d_(n, INF) {}
  void addEdge(ll v, ll to, ll cost) { G_[v].push_back(edge(to, cost)); }
  void exec(ll s, ll limit) {
    d_ = vl(n_, INF);
    priority_queue<pll, vector<pll>, greater<pll>> que;
    d_[s] = 0;
    que.push({0, s});

    while (!que.empty()) {
      pll p = que.top();
      que.pop();
      ll v = p.second;
      if (d_[v] < p.first) continue;
      for (auto& e : G_[v]) {
        if (e.cost <= limit && d_[e.to] > d_[v] + e.cost) {
          d_[e.to] = d_[v] + e.cost;
          que.push({d_[e.to], e.to});
        }
      }
    }
  }
  ll dist(ll g) { return d_[g]; }
};


int main() {
  //
  ll n;
  cin >> n;
  vl x(n), y(n);
  rep(i, n) {
    cin >> x[i] >> y[i];
  }
  Dijkstra d(n);
  rep(i, n) {
    rep(j, n) {
      if (i == j) continue;
      ll dist = (x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]);
      d.addEdge(j, i, dist);
      d.addEdge(i, j, dist);
    }
  }
  ll ok = (x[n-1] - x[0]) * (x[n-1] - x[0]) + (y[n-1] - y[0]) * (y[n-1] - y[0]);
  ll ng = 0;
  while (ok - ng > 1) {
    ll mid = (ok + ng) / 2;
    d.exec(0, mid);
    if (d.dist(n - 1) == INF) {
      ng = mid;
    } else {
      ok = mid;
    }
  }
  ll ans = (ll)sqrt(ok) / 10 * 10;
  while (ans * ans < ok) ans += 10;
  cout << ans << endl;
  return 0;
}