#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define nl '\n'
const int N = 1e5+5;
ll a[N], b[N];
ll dis(ll x, ll y, ll xx, ll yy){
return ((2*x-xx)*(2*x-xx)+(2*y-yy)*(2*y-yy));
}
int main() {
int n; cin >> n;
ll mxx = -2e9, mxy = -2e9;
ll mnx = 2e9, mny = 2e9;
for(int i=0;i<n;++i) cin >> a[i] >> b[i];
for(int i=0;i<n;++i) mxx = max(mxx, a[i]), mnx = min(mnx, a[i]);
for(int i=0;i<n;++i) mxy = max(mxy, b[i]), mny = min(mny, b[i]);
ll mx = (mxx + mnx);
ll my = (mxy + mny);
// cerr << mx << endl;
// cerr << my << endl;
double l = 0;
double r = 1e9;
int t = 100;
while(t--){
double mid = (l+r)/2;
bool ok = true;
for(int i=0;i<n;++i)
ok &= (dis(a[i], b[i], mx, my) <= mid*mid*4);
if(ok) r = mid;
else l = mid;
}
cout << fixed << setprecision(10) << l << nl;
}