#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
int k;
cin>>n;
int arr[n][2];
int ans[n];
for (int i = 0;i<n;i++) {
cin>>arr[i][0]>>arr[i][1];
}
for (int i = 0;i<n;i++) {
k = 2000000000000000000;
for (int j = 0;j<n;j++) {
if (i!=j) {
k = min(k, (arr[i][0]-arr[j][0])*(arr[i][0]-arr[j][0])+(arr[i][1]-arr[j][1])*(arr[i][1]-arr[j][1]));
}
}
ans[i]=k;
}
int t = 0;
for (int i = 0;i<n;i++) {
t = max(t,ans[i]);
}
double m = sqrt(t)/2;
cout<<fixed<<setprecision(7)<<m;
return 0;
}
