#ifndef Local
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#endif
#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define lim 100000
using namespace std;
const int mod=1000000007ll;
int c;
int parent[1000];
int find(int i){
if(parent[i]==i){
return i;
}
return parent[i]=find(parent[i]);
}
void unite(int i,int j){
int x=find(i),y=find(j);
if(x!=y){
c--;
parent[y]=x;
}
}
#define pdd pair<double,double>
double pis(pdd&x,pdd&y){
double X=abs(x.first-y.first);
double Y=abs(x.second-y.second);
return sqrt(X*X+Y*Y)/2;
}
void solve(){
int n;
cin>>n;
c=n;
for(int i=0;i<n;i++)parent[i]=i;
pdd a[n];
for(int i=0;i<n;i++){
cin>>a[i].first>>a[i].second;
}
set<pair<double,pair<int,int>>>all;
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(i!=j){
all.insert({pis(a[i],a[j]),{i,j}});
}
}
}
double last=0;
while(c!=1&&all.size()){
auto p=*all.begin();
last=p.first;
unite(p.second.first,p.second.second);
all.erase(p);
}
//cerr<<c<<"\n";
cout<<setprecision(15)<<last<<"\n";
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);cout.tie(NULL);
#ifdef Local
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
solve();
}
