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

using ll = long long;
using Vi = vector<int>;
using Vl = vector<ll>;
using Pii = pair<int, int>;
using Pll = pair<ll, ll>;

constexpr int I_INF = numeric_limits<int>::max();
constexpr ll L_INF = numeric_limits<ll>::max();

class Prints {
private:
    class __Prints {
    public:
        __Prints(const char* sep, const char* term) : sep(sep), term(term) {}
        template <class... Args>
        void operator()(Args&&... args) const { print(std::forward<Args>(args)...); }

    private:
        const char *sep, *term;
        void print() const { std::cout << term; }
        void print_rest() const { std::cout << term; }
        template <class T, class... Tail>
        void print(T&& head, Tail&&... tail) const { std::cout << head, print_rest(std::forward<Tail>(tail)...); }
        template <class T, class... Tail>
        void print_rest(T&& head, Tail&&... tail) const { std::cout << sep << head, print_rest(std::forward<Tail>(tail)...); }
    };

public:
    Prints() {}
    __Prints operator()(const char* sep = " ", const char* term = "\n") const { return __Prints(sep, term); }
    template <class T>
    void print_vec(const std::vector<T>& vec, const char* sep = " ", const char* term = "\n") const {
        const size_t sz = vec.size();
        for (size_t i = 0; i < sz; i++) std::cout << vec[i] << (i == sz - 1 ? term : sep);
    }
};

Prints prints;

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

using Pos = array<double, 2>;

double dist(const Pos& a, const Pos& b) {
    double dx = a[0] - b[0];
    double dy = a[1] - b[1];
    return sqrt(dx * dx + dy * dy);
}

void solve() {
    ll N;
    cin >> N;
    vector<Pos> ps(N);
    for (ll i = 0; i < N; i++) {
        cin >> ps[i][0] >> ps[i][1];
    }

    double left = 0.0, right = 100000.0;
    constexpr double eps = 1e-8;
    vector<Pos> ins;
    for (ll _ = 0; _ < 500; _++) {
        double mid = (left + right) / 2.0;
        ins.clear();
        for (ll i = 0; i < N; i++) {
            for (ll j = i + 1; j < N; j++) {
                double d = dist(ps[i], ps[j]);
                if (d > mid * 2.0 + eps) continue;
                Pos c;
                c[0] = (ps[i][0] + ps[j][0]) / 2.0;
                c[1] = (ps[i][1] + ps[j][1]) / 2.0;
                double dx, dy, r;
                dx = ps[i][0] - ps[j][0];
                dy = ps[i][1] - ps[j][1];
                r = sqrt(dx * dx + dy * dy);
                double e = sqrt(mid * mid - d * d * 0.25);
                double xn, yn;
                xn = c[0] + e * dy / r;
                yn = c[1] - e * dx / r;
                ins.push_back({xn, yn});
                xn = c[0] - e * dy / r;
                yn = c[1] + e * dx / r;
                ins.push_back({xn, yn});
            }
        }

        bool ok = false;
        for (const auto& p : ins) {
            bool good = true;
            for (ll i = 0; i < N; i++) {
                if (dist(p, ps[i]) > mid + eps) {
                    good = false;
                    break;
                }
            }
            if (good) {
                ok = true;
                break;
            }
        }

        if (ok) {
            right = mid;
        }
        else {
            left = mid;
        }
    }

    prints()(right);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

int main() {
#ifdef FASTIO
    cin.tie(0), cout.tie(0);
    ios::sync_with_stdio(false);
#endif
#ifdef FILEINPUT
    ifstream ifs("./in_out/input.txt");
    cin.rdbuf(ifs.rdbuf());
#endif
#ifdef FILEOUTPUT
    ofstream ofs("./in_out/output.txt");
    cout.rdbuf(ofs.rdbuf());
#endif
    cout << setprecision(18) << fixed;
    solve();
    cout << flush;
    return 0;
}

Measured memory_bytes: 3832