#include <bits/stdc++.h>

template <typename T>
T BinarySearch(T ok, T ng, std::function<bool(T)> pred) {
  if constexpr (std::is_integral<T>::value) {
    while ((ok > ng ? ok - ng : ng - ok) > 1) {
      T mid = ok + (ng - ok) / 2;
      (pred(mid) ? ok : ng) = mid;
    }
    return ok;
  }
  if constexpr (std::is_floating_point<T>::value) {
    for (int i = 0; i < 200; ++i) {
      T mid = (ok + ng) / 2;
      (pred(mid) ? ok : ng) = mid;
    }
    return ok;
  }
}

template <typename T>
struct Vector {
  T x, y;
  T Norm() const { return std::sqrt(x * x + y * y); }
  Vector& operator+=(const Vector& v) {
    (*this).x += v.x;
    (*this).y += v.y;
    return *this;
  }
  Vector operator+(const Vector& v) const { return Vector(*this) += v; }
  Vector& operator-=(const Vector& v) {
    (*this).x -= v.x;
    (*this).y -= v.y;
    return *this;
  }
  Vector operator-(const Vector& v) const { return Vector(*this) -= v; }
  Vector& operator*=(T t) {
    (*this).x *= t;
    (*this).y *= t;
    return *this;
  }
  Vector operator*(T t) const { return Vector(*this) *= t; }
  bool operator<(const Vector& v) const {
    if (x != v.x) {
      return x < v.x;
    }
    return y < v.y;
  }
  Vector Rot90() const { return {-y, x}; }

  // TODO:
  // * Rename this struct to Point and add method that treats this struct as
  //   a 2D vector (e.g., dot product) and as a complex number (arc, multiple
  //   number multiplication, ...).
  //   Check the STL functions:
  //   https://ja.cppreference.com/w/cpp/numeric/complex Check the wikipedia
  //   page: https://en.wikipedia.org/wiki/Complex_number
  // * Replace Rot90 with more generic Rotate(arg) function.
  // * Think about a way to visualize these objects for debugging. One idea is
  //   to add an external library that renders these objects using Cairo.
  //   For visualization, WolframAlpha is also extremely useful, for example it
  //   even calculates intersections if provided 2 circles. Try:
  //   (x-1)^2+y^2=5^2, (x+7)^2+y^2=3^2
  // * Add common constants like pi.
};

template <typename T>
std::istream& operator>>(std::istream& is, Vector<T>& v) {
  is >> v.x >> v.y;
  return is;
}

template <typename T>
std::ostream& operator<<(std::ostream& os, const Vector<T>& v) {
  os << "(" << v.x << "," << v.y << ")";
  return os;
}

template <typename T>
struct Circle {
  using V = Vector<T>;
  V center;
  double radius;

  std::vector<V> Intersections(const Circle& c) const {
    // TODO: Handle cases where there is no intersection and there is only one
    // intersection.
    auto sq = [](T x) -> T { return x * x; };
    V v = c.center - center;
    T l = v.Norm();
    if (l >= radius + c.radius || (l + radius) <= c.radius ||
        (l + c.radius) <= radius) {
      return {};
    }
    T x = (sq(radius) - sq(c.radius) + sq(l)) / (2 * l);
    T a = std::sqrt(sq(radius) - sq(x));
    V perpendicular_foot = v * (x / l);
    V perpendicular = v.Rot90() * (a / l);
    return {center + perpendicular_foot + perpendicular,
            center + perpendicular_foot - perpendicular};
  }

  // TODO: Add Contains method that checks if a point is contained in the
  // circle. That function should use EPS on check to take into account the
  // computation error. Proabbly this library should also provide a commom EPS
  // value (or provide utility functions that uses EPS inside of it).
};

const double pi = acos(-1);

template <typename T, typename _ = void>
struct is_container : std::false_type {};
template <typename T>
struct is_container<T, std::void_t<decltype(std::declval<T>().begin()),
                                   decltype(std::declval<T>().end())>>
    : std::true_type {};
template <typename T, typename _ = void>
struct is_pair : std::false_type {};
template <typename T>
struct is_pair<T, std::void_t<decltype(std::declval<T>().first),
                              decltype(std::declval<T>().second)>>
    : std::true_type {};
template <typename T>
void debug(const T& v) {
  if constexpr (is_pair<T>::value) {
    std::cerr << "{";
    debug(v.first);
    std::cerr << ", ";
    debug(v.second);
    std::cerr << "}";
  } else if constexpr (is_container<T>::value) {
    std::cerr << "{";
    for (auto it = v.begin(); it != v.end(); ++it) {
      if (it != v.begin()) std::cerr << ", ";
      debug(*it);
    }
    std::cerr << "}";
  } else {
    std::cerr << v;
  }
}
template <typename T, typename... Ts>
void debug(const T& value, const Ts&... args) {
  debug(value);
  std::cerr << ", ";
  debug(args...);
}
#if DEBUG
#define dbg(...)                        \
  do {                                  \
    cerr << #__VA_ARGS__ << ": ";       \
    debug(__VA_ARGS__);                 \
    cerr << " (L" << __LINE__ << ")\n"; \
  } while (0)
#else
#define dbg(...)
#endif

void read_from_cin() {}
template <typename T, typename... Ts>
void read_from_cin(T& value, Ts&... args) {
  std::cin >> value;
  read_from_cin(args...);
}
#define rd(type, ...) \
  type __VA_ARGS__;   \
  read_from_cin(__VA_ARGS__);

template <typename T>
void write_to_cout(const T& value) {
  if constexpr (std::is_same<T, bool>::value) {
    std::cout << (value ? "Yes" : "No");
  } else {
    std::cout << value;
  }
}
template <typename T, typename... Ts>
void write_to_cout(const T& value, const Ts&... args) {
  write_to_cout(value);
  std::cout << ' ';
  write_to_cout(args...);
}
#define wt(...)                 \
  do {                          \
    write_to_cout(__VA_ARGS__); \
    cout << '\n';               \
  } while (0)

#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rrep(i, n) for (int i = (int)(n)-1; i >= 0; --i)

template <typename T>
std::istream& operator>>(std::istream& is, std::vector<T>& v) {
  for (T& vi : v) is >> vi;
  return is;
}

template <typename T, typename U>
bool chmax(T& a, U b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

template <typename T, typename U>
bool chmin(T& a, U b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}

#include <boost/hana/functional/fix.hpp>
auto Fix = boost::hana::fix;

using ll = long long;

template <typename T>
using low_priority_queue =
    std::priority_queue<T, std::vector<T>, std::greater<T>>;

template <typename T>
using V = std::vector<T>;
template <typename T>
using VV = V<V<T>>;

using namespace std;

using Vec = Vector<double>;

int main() {
  rd(int, N);
  V<Vec> vec(N);
  cin >> vec;
  cout << setprecision(10);
  wt(BinarySearch<double>(10000000000, 0, [&](double mid) {
    rep(i, N) rep(j, i) {
      vector<Vec> vs =
          (Circle<double>{vec[i], mid}).Intersections({vec[j], mid});
      for (const Vec& v : vs) {
        bool ok = true;
        rep(k, N) if ((vec[k] - v).Norm() > mid + 1e-9) ok = false;
        if (ok) return true;
      }
    }
    return false;
  }));
}


Measured memory_bytes: 3816