#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define inf (int)3e18
#define ff first
#define ss second
using vi = vector<int>;
using vii = vector<pair<int, int>>;
using vvi = vector<vector<int>>;
using pii = pair<int, int>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MAX = 3e5 + 5;
void solve()
{
int n;
cin >> n;
vii a;
for (int i = 1; i <= n; i++)
{
int u, v;
cin >> u >> v;
a.push_back({u, v});
}
long double dist = 1000000000.0;
for (int i = 0; i < n; i++)
{
for (int j = i + 1; j < n; j++)
{
long double x = (long double)(a[j].ff + a[i].ff) / 2;
long double y = (long double)(a[j].ss + a[i].ss) / 2;
long double r = (x - a[i].ff) * (x - a[i].ff) + (y - a[i].ss) * (y - a[i].ss);
r = sqrtl(r);
dist = min(dist, r);
}
}
cout << fixed << setprecision(7) << dist;
}
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int tt = 1;
// cin >> tt;
while (tt--)
solve();
}
