#include <bits/stdc++.h>
using namespace std;
#define int long long
void solve() {
vector<int> vt;
int n;
cin >> n;
double a[n + 1];
double b[n + 1];
for(int i = 1; i <= n; i++) {
cin >> a[i] >> b[i];
}
if(n == 1) {
cout << setprecision(7) << fixed << 0 << endl;
return;
}
double ans = 0;
for(int i = 1; i <= n; i++) {
double an = 1e18;
for(int j = 1; j <= n; j++) {
if(i != j) {
an = min(an, sqrt((abs(a[i] - a[j]) / 2) * (abs(a[i] - a[j]) / 2) + (abs(b[i] - b[j]) / 2) * (abs(b[j] - b[i]) / 2)));
}
}
ans = max(ans, an);
}
cout << setprecision(7) << fixed << ans << endl;
}
signed main(){
int t = 1;
//cin >> t;
while(t--){
solve();
}
}
