#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <limits>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <functional>
#include <iomanip>

using namespace std;

#ifdef LOCAL
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
#define eprintf(...) 42
#endif
using ll = long long;
using vll = std::vector<ll>;
using vvll = std::vector<vll>;
using vvvll = std::vector<vvll>;
#define reps(i, S, E) for (ll i = (S); i <= (E); i++)
#define rep(i, N) reps(i, 0, N-1)
#define deps(i, E, S) for (ll i = (E); i >= (S); i--)
#define dep(i, N) deps(i, N-1, 0)
const ll INF = 1LL << 60;
const int INF_INT = 1 << 30;

template<class T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; }return false; }
template<class T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; }return false; }
struct mll {
	static ll MOD;
	ll val;
	mll(ll v = 0) : val(v % MOD) { if (val < 0) val += MOD; }
	mll operator - () const { return -val; }
	mll operator + (const mll &b) const { return val + b.val; }
	mll operator - (const mll &b) const { return val - b.val; }
	mll operator * (const mll &b) const { return val * b.val; }
	mll operator / (const mll &b) const { return mll(*this) /= b; }
	mll operator + (ll b) const { return *this + mll(b); }
	mll operator - (ll b) const { return *this - mll(b); }
	mll operator * (ll b) const { return *this * mll(b); }
	friend mll operator + (ll a, const mll &b) { return b + a; }
	friend mll operator - (ll a, const mll &b) { return -b + a; }
	friend mll operator * (ll a, const mll &b) { return b * a; }
	mll &operator += (const mll &b) { val = (val + b.val) % MOD; return *this; }
	mll &operator -= (const mll &b) { val = (val + MOD - b.val) % MOD; return *this; }
	mll &operator *= (const mll &b) { val = (val*b.val) % MOD; return *this; }
	mll &operator /= (const mll &b) {
		ll c = b.val, d = MOD, u = 1, v = 0;
		while (d) {
			ll t = c / d;
			c -= t * d; swap(c, d);
			u -= t * v; swap(u, v);
		}
		val = val * u % MOD;
		if (val < 0) val += MOD;
		return *this;
	}
	mll &operator += (ll b) { return *this += mll(b); }
	mll &operator -= (ll b) { return *this -= mll(b); }
	mll &operator *= (ll b) { return *this *= mll(b); }
	mll &operator /= (ll b) { return *this /= mll(b); }
	bool operator == (const mll &b) { return val == b.val; }
	bool operator != (const mll &b) { return val != b.val; }
	bool operator == (ll b) { return *this == mll(b); }
	bool operator != (ll b) { return *this != mll(b); }
	friend bool operator == (ll a, const mll &b) { return mll(a) == b.val; }
	friend bool operator != (ll a, const mll &b) { return mll(a) != b.val; }
	friend ostream &operator << (ostream &os, const mll &a) { return os << a.val; }
	friend istream &operator >> (istream &is, mll &a) { return is >> a.val; }
	static mll Combination(ll a, ll b) {
		chmin(b, a - b);
		if (b < 0) return mll(0);
		mll c = 1;
		rep(i, b) c *= a - i;
		rep(i, b) c /= i + 1;
		return c;
	}
};
using vmll = std::vector<mll>;
using vvmll = std::vector<vmll>;
using vvvmll = std::vector<vvmll>;
using vvvvmll = std::vector<vvvmll>;

struct Fast {
	Fast() {
		cin.tie(0);
		ios::sync_with_stdio(false);
		cout << fixed << setprecision(std::numeric_limits<double>::max_digits10);
	}
} fast; //cin,cout高速化のおまじない＋桁数指定

ll mll::MOD = (ll)(1e9 + 7);// 998244353ll;

//--debug--
#ifdef LOCAL
void _debug_out_(string s = "") {
	if (s != "") { eprintf(s.c_str()); } else { eprintf("\n"); }
}
void _debug_out_(ll x, string s = "") {
	if (s != "") { eprintf(s.c_str(), x); }	else { eprintf("%lld\n", x); }
}
void _debug_out_(vvll x, string s = "") {
	string t = s;
	if (s == "") {
		ll maxLen = 0;
		rep(i, (ll)x.size()) rep(j, (ll)x[i].size()) {
			ll n = x[i][j] / 10, len = 1;
			while (n > 0) { len++; n /= 10; }
			chmax(maxLen, len);
		}
		t = "%" + to_string(maxLen) + "lld ";
	}
	rep(i, (ll)x.size()) { rep(j, (ll)x[i].size()) { eprintf(t.c_str(), x[i][j]); } eprintf("\n"); }
	eprintf("\n");
}
void _debug_out_(vll x, string s = "") {
	rep(i, (ll)x.size()) { if (s != "") { eprintf(s.c_str(), x[i]); } else { eprintf("%lld ", x[i]); } }
	eprintf("\n");
}
void _debug_out_(vector<bool> x) {
	rep(i, (ll)x.size()) { eprintf("%s", x[i] ? "o" : "x");	}
	eprintf("\n");
}
void _debug_out_(vector<vector<bool>> x) {
	rep(i, (ll)x.size()) { rep(j, (ll)x[i].size()) { eprintf("%s", x[i][j] ? "o" : "x"); } eprintf("\n"); }
	eprintf("\n");
}
void _debug_out_(map<ll, ll> x) {
	auto begin = x.begin(), end = x.end();
	for (auto iter = begin; iter != end; iter++) { eprintf("%lld:%lld ", iter->first, iter->second); }
	eprintf("\n");
}
#define debug_out(...) _debug_out_(__VA_ARGS__)
#else
#define debug_out(...) 42
#endif
//--debug--


/* 幾何ライブラリ */
using DD = double;
const DD DINF = 1LL << 60;      // to be set appropriately
const DD EPS = 1e-10;        // to be set appropriately
const DD PI = acosl(-1.0);
DD torad(int deg) { return (DD)(deg)* PI / 180; }
DD todeg(DD ang) { return ang * 180 / PI; }

/* Point */
struct Point {
	DD x, y;
	Point(DD x = 0.0, DD y = 0.0) : x(x), y(y) {}
	friend ostream& operator << (ostream &s, const Point &p) { return s << '(' << p.x << ", " << p.y << ')'; }
};
inline Point operator + (const Point &p, const Point &q) { return Point(p.x + q.x, p.y + q.y); }
inline Point operator - (const Point &p, const Point &q) { return Point(p.x - q.x, p.y - q.y); }
inline Point operator * (const Point &p, DD a) { return Point(p.x * a, p.y * a); }
inline Point operator * (DD a, const Point &p) { return Point(a * p.x, a * p.y); }
inline Point operator * (const Point &p, const Point &q) { return Point(p.x * q.x - p.y * q.y, p.x * q.y + p.y * q.x); }
inline Point operator / (const Point &p, DD a) { return Point(p.x / a, p.y / a); }
inline Point conj(const Point &p) { return Point(p.x, -p.y); }
inline Point rot(const Point &p, DD ang) { return Point(cos(ang) * p.x - sin(ang) * p.y, sin(ang) * p.x + cos(ang) * p.y); }
inline Point rot90(const Point &p) { return Point(-p.y, p.x); }
inline DD cross(const Point &p, const Point &q) { return p.x * q.y - p.y * q.x; }
inline DD dot(const Point &p, const Point &q) { return p.x * q.x + p.y * q.y; }
inline DD norm(const Point &p) { return dot(p, p); }
inline DD abs(const Point &p) { return sqrt(dot(p, p)); }
inline DD amp(const Point &p) { DD res = atan2(p.y, p.x); if (res < 0) res += PI * 2; return res; }
inline bool eq(const Point &p, const Point &q) { return abs(p - q) < EPS; }
inline bool operator < (const Point &p, const Point &q) { return (abs(p.x - q.x) > EPS ? p.x < q.x : p.y < q.y); }
inline bool operator > (const Point &p, const Point &q) { return (abs(p.x - q.x) > EPS ? p.x > q.x : p.y > q.y); }
inline Point operator / (const Point &p, const Point &q) { return p * conj(q) / norm(q); }

/* Line */
struct Line : vector<Point> {
	Line(Point a = Point(0.0, 0.0), Point b = Point(0.0, 0.0)) {
		this->push_back(a);
		this->push_back(b);
	}
	friend ostream& operator << (ostream &s, const Line &l) { return s << '{' << l[0] << ", " << l[1] << '}'; }
};

// 1：a-bから見てcは左側(反時計回り)、-1：a-bから見てcは右側(時計回り)、0：一直線上
int simple_ccw(const Point &a, const Point &b, const Point &c) {
	if (cross(b - a, c - a) > EPS) return 1;
	if (cross(b - a, c - a) < -EPS) return -1;
	return 0;
}

// 円や直線の交点
vector<Point> crosspoint(const Line &l, const Line &m) {
	vector<Point> res;
	DD d = cross(m[1] - m[0], l[1] - l[0]);
	if (abs(d) < EPS) return vector<Point>();
	res.push_back(l[0] + (l[1] - l[0]) * cross(m[1] - m[0], m[1] - l[0]) / d);
	return res;
}

// 外心
Point gaisin(Point a, Point b, Point c) {
	Line ab((a + b) / 2, (a + b) / 2 + rot90(a - b));
	Line bc((b + c) / 2, (b + c) / 2 + rot90(b - c));
	return crosspoint(ab, bc)[0];
}

int main() {
	int N; cin >> N;
	vector<Point> v(N);
	for (int i = 0; i < N; ++i) cin >> v[i].x >> v[i].y;

	// 候補
	vector<Point> alt;
	for (int i = 0; i < N; ++i) {
		for (int j = i + 1; j < N; ++j) {
			alt.push_back((v[i] + v[j]) / 2);

			for (int k = j + 1; k < N; ++k) {
				if (simple_ccw(v[i], v[j], v[k]) == 0) {
					continue;
				}
				auto r = gaisin(v[i], v[j], v[k]);
				alt.push_back(r);
			}
		}
	}

	DD res = DINF;
	for (auto r : alt) {
		DD tmp = 0;
		for (auto p : v) {
			chmax(tmp, abs(p - r));
		}
		chmin(res, tmp);
	}
	cout <<  res << endl;
}

Measured memory_bytes: 888