#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
ll n;
cin >> n;
vector<pair<ll,ll>> v;
for (int i=0;i<n;i++){
ll x,y;
cin >> x >> y;
v.push_back({x,y});
}
vector<pair<ll,double>> adj[n+5];
for (int i=0;i<n;i++){
for (int j=i+1;j<n;j++){
ll x1=v[i].first, y1 = v[i].second, x2 = v[j].first, y2 = v[j].second;
double dist = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
adj[i].push_back({j,dist});
adj[j].push_back({i,dist});
}
}
ll visited[n+5];
memset(visited,-1,sizeof(visited));
ll l=0,r=2000000000000000000;
while (l<r){
ll m = l+(r-l)/2;
visited[0] = m;
queue<ll> q;
q.push(0);
ll count=0;
while (!q.empty()){
ll x = q.front();
q.pop();
count++;
for (auto it=adj[x].begin(); it != adj[x].end(); ++it){
if (visited[(*it).first]==m) continue;
if ((*it).second > m) continue;
visited[(*it).first] = m;
q.push((*it).first);
}
}
if (count < n) l=m+1;
else r=m;
}
cout << fixed << setprecision(15) << sqrt(l)/2;
}
