#include <bits/stdc++.h> using namespace std; signed main() { int n; cin>>n; vector<pair<long long,long long>>v(n); for(auto &z : v) cin>>z.first>>z.second; long double mx = 0; for(int i = 0 ; i < n ; i++) { long double mn = LDBL_MAX; for(int j = 0 ; j < n ; j++) { if(i == j) continue; long long a = abs(v[i].first-v[j].first),b = abs(v[i].second-v[j].second); long double temp = (sqrt(a*a + b*b))/2; mn = min(mn,temp); } mx=max(mx,mn); } cout << fixed << setprecision(8) << mx; }