#include <bits/stdc++.h>
using namespace std;
#define int long long
long double dist(int x1, int y1, int x2, int y2) {
long long dist = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
cout << setprecision(30); long double ans = pow(dist, 0.5);
return ans;
}
signed main() {
int n; cin >> n;
vector<pair<int, int>> a(n);
for (int i = 0; i < n; i++) cin >> a[i].first >> a[i].second;
long double low = 0;
long double high = 1e9;
while (high-low > 1e-6) {
long double mid = (high+low)/2.0;
int poss = 1;
vector<vector<int>> edges(n);
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (i != j and dist(a[i].first, a[i].second, a[j].first, a[j].second) <= mid*2.0) {
edges[i].push_back(j);
edges[j].push_back(i);
}
}
}
int visited[n]; for (int i = 0; i < n; i++) visited[i] = 0;
for (int i = 0; i < 1; i++) {
if (visited[i] == 1) continue;
queue <int> x;
x.push(i);
while (x.size() > 0) {
int a = x.front();
x.pop();
for (auto j:edges[a]) {
if (visited[j] == 0) {
visited[j] = 1;
x.push(j);
}
}
}
}
int count = 0; for (int i = 0; i < n; i++) count += visited[i];
if (count != n) low = mid;
else high = mid;
}
cout << setprecision(25) << low;
}
