#include "bits/stdc++.h"
using namespace std;
#define int long long
#define double long double
#define INF 1000000000000000000
#define MOD 1000000007
vector<int> adj[2000];
bool v[2000];
void dfs(int x) {
v[x] = 1;
for(int i : adj[x]) if(!v[i]) dfs(i);
}
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n;
cin >> n;
int x[n], y[n];
for(int i = 0; i < n; i++) cin >> x[i] >> y[i];
double l = 0, r = 2e9, m;
while(r-l > 1e-8) {
m = (l+r)/2;
for(int i = 0; i < n; i++) {
for(int j = 0; j < i; j++) {
if((x[i]-x[j])*(x[i]-x[j]) + (y[i]-y[j])*(y[i]-y[j]) <= m*m) {
adj[i].push_back(j);
adj[j].push_back(i);
}
}
}
dfs(0);
bool f = true;
for(int i = 0; i < n; i++) if(!v[i]) f = false;
if(f) r = m;
else l = m;
for(int i = 0; i < n; i++) {
adj[i].clear();
v[i] = 0;
}
}
cout << fixed << setprecision(7) << l/2 << '\n';
}
