#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
#define rep(i, n) for (int i = 0; i < (n); i++)
#define reps(i, n) for (int i = 1; i <= (n); i++)
#define all(x) begin(x), end(x)
#define uniq(x) (x).erase(unique(all(x)), end(x))
#define bit(n) (1LL << (n))
#define dump(x) cerr << #x " = " << (x) << endl
using vint = vector<int>;
using vvint = vector<vint>;
using pint = pair<int, int>;
using vpint = vector<pint>;
template<typename T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
constexpr double pi = 3.1415926535897932384626433832795028L;
constexpr int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
constexpr int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
int gcd(int a, int b) {
    while (b) { swap(a %= b, b); }
    return a;
}
int lcm(int a, int b) { return a / gcd(a, b) * b; }
template<typename T> void fin(T mes) {
    cout << mes << endl;
    exit(0);
}
template<typename T, typename U> bool chmax(T &a, const U &b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template<typename T, typename U> bool chmin(T &a, const U &b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}
template<typename T, typename U> ostream &operator<<(ostream &os, const pair<T, U> &rhs) {
    os << "(" << rhs.first << ", " << rhs.second << ")";
    return os;
}
template<typename T> ostream &operator<<(ostream &os, const vector<T> &rhs) {
    os << "{";
    for (auto itr = rhs.begin(); itr != rhs.end(); itr++) {
        os << *itr << (next(itr) != rhs.end() ? ", " : "");
    }
    os << "}";
    return os;
}
struct setup {
    static constexpr int PREC = 20;
    setup() {
        cout << fixed << setprecision(PREC);
        cerr << fixed << setprecision(PREC);
    };
} setup;

template<typename T> double dot(T v0, T v1) { return v0.first * v1.first + v0.second * v1.second; }
int N;
int x[1100], y[1100];
signed main() {
    cin >> N;
    rep(i, N) { cin >> x[i] >> y[i]; }
    double ans = numeric_limits<double>::infinity();

    rep(i, N) {
        rep(j, i) {
            double ox = (x[i] + x[j]) * 0.5;
            double oy = (y[i] + y[j]) * 0.5;
            double cr = 0;
            rep(p, N) {
                pair<double, double> v = {x[p] - ox, y[p] - oy};
                chmax(cr, sqrt(dot(v, v)));
            }
            chmin(ans, cr);
        }
    }
    rep(i, N) {
        rep(j, i) {
            rep(k, j) {
                pint a = {x[j] - x[k], y[j] - y[k]};
                pint b = {x[k] - x[i], y[k] - y[i]};
                pint c = {x[i] - x[j], y[i] - y[j]};
                double la = sqrt(dot(a, a));
                double lb = sqrt(dot(b, b));
                double lc = sqrt(dot(c, c));
                double cosA = dot(b, c) / lb / lc;
                double cosB = dot(c, a) / lc / la;
                double cosC = dot(a, b) / la / lb;
                double ox = (la * cosA * x[i] + lb * cosB * x[j] + lc * cosC * x[k])
                    / (la * cosA + lb * cosB + lc * cosC);
                double oy = (la * cosA * y[i] + lb * cosB * y[j] + lc * cosC * y[k])
                    / (la * cosA + lb * cosB + lc * cosC);
                if (a.first * b.second == a.second * b.first) { continue; }
                double cr = 0;
                rep(p, N) {
                    pair<double, double> v = {x[p] - ox, y[p] - oy};
                    chmax(cr, sqrt(dot(v, v)));
                }
                chmin(ans, cr);
            }
        }
    }
    cout << ans << endl;
}


Measured memory_bytes: 256