#include <bits/stdc++.h>

using namespace std;

#define DUMP(x) std::cerr << (#x) << " = " << (x) << "\n"
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define REP(i, k, n) for (int i = (k); i < (int)(n); ++i)
#define ALL(r) r.begin(), r.end()
#define YES puts("YES")
#define Yes puts("Yes")
#define NO puts("NO")
#define No puts("No")
#define IMP puts("IMPOSSIBLE")
#define Imp puts("Impossible")
#define imp puts("impossible")
#define M1 puts("-1")
#define pb emplace_back

template <typename T>
ostream &operator<<(ostream &os, vector<T> &v)
{
    os << "{";
    rep(i, v.size()) os << v[i] << (i == (int)v.size() - 1 ? "" : ", ");
    os << "}";
    return os;
}
template <typename T>
T dup(T x, T y)
{
    return (x + y - 1) / y;
};
template <typename A, size_t N, typename T>
inline void arrayFill(A (&array)[N], const T &val) { std::fill((T *)array, (T *)(array + N), val); }
struct in
{
    const size_t n = 0;
    in() = default;
    in(size_t n) : n(n){};
    template <typename T>
    operator T()
    {
        T ret;
        cin >> ret;
        return ret;
    }
    template <typename T>
    operator vector<T>()
    {
        assert(n != 0);
        vector<T> ret(n);
        for (auto &x : ret)
            cin >> x;
        return ret;
    }
};

using ll = int64_t;
using vint = vector<int32_t>;
using vvint = vector<vint>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vstr = vector<string>;
using pint = pair<int32_t, int32_t>;
using vpint = vector<pint>;
using pll = pair<ll, ll>;
using setint = set<int32_t>;
using setstr = set<string>;
using qint = queue<int32_t>;
using qpint = queue<pint>;

constexpr std::int32_t INF = 1001001001;
constexpr std::int64_t LINF = 1001001001001001001;

using ld = double;
using P = complex<ld>;
using G = vector<P>;
const ld pi = acos(-1);
const ld eps = 1e-10;
const ld inf = 1e12;

ld cross(const P &a, const P &b) { return a.real() * b.imag() - a.imag() * b.real(); }
ld dot(const P &a, const P &b) { return a.real() * b.real() + a.imag() * b.imag(); }

using C = pair<ld, P>;
#define rad first
#define pnt second

C smallest_enclosing_disc(vector<P> ps)
{
    auto c3 = [](const P &a, const P &b, const P &c) {
        ld A = norm(b - c);
        ld B = norm(c - a);
        ld C = norm(a - b);
        ld S = abs(cross(b - a, c - a));
        P p = (A * (B + C - A) * a + B * (C + A - B) * b + C * (A + B - C) * c) / (4 * S * S);
        ld r = abs(p - a);
        return make_pair(r, p);
    };

    auto c2 = [](const P &a, const P &b) {
        P c = (a + b) / (ld)2;
        ld r = abs(a - c);
        return make_pair(r, c);
    };

    auto in_circle = [](const P &a, const C &c) {
        return norm(a - c.pnt) <= c.rad * c.rad + eps;
    };

    int n = ps.size();
    random_shuffle(ps.begin(), ps.end());
    C c = c2(ps[0], ps[1]);
    for (int i = 2; i < n; ++i)
    {
        if (!in_circle(ps[i], c))
        {
            c = c2(ps[0], ps[i]);
            for (int j = 1; j < i; ++j)
            {
                if (!in_circle(ps[j], c))
                {
                    c = c2(ps[j], ps[i]);
                    for (int k = 0; k < j; ++k)
                    {
                        if (!in_circle(ps[k], c))
                        {
                            c = c3(ps[i], ps[j], ps[k]);
                        }
                    }
                }
            }
        }
    }
    return c;
}
void Main()
{
    int n;
    cin >> n;
    vector<P> ps(n);
    rep(i, n)
    {
        ld x, y;
        cin >> x >> y;
        ps[i] = P(x, y);
    }
    cout << (double)smallest_enclosing_disc(ps).rad;
}

signed main()
{
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}


Measured memory_bytes: 256