/*	author:  Kite_kuma
	created: 2020.09.11 23:51:29 */

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

#pragma region aliases

#define rep(i, n) for(long long i = 0; i < (n); i++)
#define rrep(i, n) for(long long i = (n)-1; i > -1; i--)
#define Rep(i, m, n) for(long long i = (m); i < (n); i++)
#define rRep(i, m, n) for(long long i = (n)-1; i >= (m); i--)
#define REP(i, m, n, p) for(long long i = m; i < n; i += p)
#define foa(s, v) for(auto &s : v)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define bcnt(n) __builtin_popcountll(n)
#define endk endl
#define ednl endl
#define enld endl

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using vb = vector<bool>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vvvi = vector<vector<vector<int>>>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using mll = map<long long, long long>;
using pll = pair<long long, long long>;
using qll = queue<long long>;
using sll = set<long long>;
using vpll = vector<pair<long long, long long>>;
template <class T = ll>
using V = vector<T>;
template <class T = ll>
using VV = V<V<T>>;
template <class T = ll>
using VVV = V<V<V<T>>>;
//昇順pq(小さい方から取り出す)
template <class T = ll>
using pqup = priority_queue<T, vector<T>, greater<T>>;
//降順pq(大きい方から取り出す)
template <class T = ll>
using pqdn = priority_queue<T>;

#pragma endregion

#pragma region constants

long long const limLL = 9223372036854775807;  // POW(2,63)-1 ~ 9.22e18
long long const dekai = 3e16;
const long double pi = acos(-1);
const char el = '\n';
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
int ddx[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
int ddy[8] = {-1, 0, 1, -1, 1, -1, 0, 1};

const int mod = 1000000007;
// const int mod = 998244353;

#pragma endregion

#pragma region basic_procedure

template <class T>
inline bool isin(T x, T lef, T rig) {
	return ((lef <= x) && (x < rig));
}

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

void Yes(bool f = 1) { cout << (f ? "Yes" : "No") << "\n"; }
void No() { cout << "No\n"; }
void YES(bool f = 1) { cout << (f ? "YES" : "NO") << "\n"; }
void NO() { cout << "NO\n"; }
template <class T>
void drop(T answer) {
	cout << answer << "\n";
	exit(0);
}
void err() {
	cout << -1 << "\n";
	exit(0);
}

vector<long long> vin(long long n) {  //整数n個の入力を受け取ってベクトルに突っ込んで返す
	vector<long long> v(n);
	for(long long i = 0; i < n; i++) {
		cin >> v[i];
	}
	return v;
}

//ベクトルの出力(検証済)
// vectorの中身を出力する 答えの出力に利用可能
template <class T>
void vout(vector<T> &v, bool tate = 0) {
	if(v.size() > 0) {
		for(auto it = v.begin(); it < v.end(); it++) {
			cout << *it;
			if(it != v.end() - 1) {
				if(tate)
					cout << endl;
				else
					cout << " ";
			}
		}
	}
	cout << endl;
}

template <class T>
void add(vector<T> &v, T val) {	 //ベクトルの各要素に加算
	for(auto &a : v) a += val;
	return;
}

// vectorの中身を数える map<要素,個数>を返す
template <class T>
map<T, long long> cntv(vector<T> v) {
	map<T, long long> m;
	for(auto &g : v) {
		if(m.count(g))
			m[g]++;
		else
			m[g] = 1;
	}
	return m;
}

//配列圧縮(検証済)
//{1,36,1,3,8,-2,-92}を
//{2, 5,2,3,4, 1,  0}にする
template <class T>
vector<long long> press(vector<T> &v) {
	long long n = v.size();
	vector<long long> w(n);
	map<T, long long> m;
	for(T &p : v) m[p] = 0;
	long long i = 0;
	for(auto &p : m) {
		p.second = i;
		i++;
	}
	for(long long i = 0; i < n; i++) w.at(i) = m[v.at(i)];
	return w;
}

template <class T>
T divup(T a, T b) {
	//端数繰りあがり割り算
	assert(b != 0);
	T x = abs(a);
	T y = abs(b);
	T z = (x + y - 1) / y;
	if((a < 0 && b > 0) || (a > 0 && b < 0))
		return -z;
	else if(a == 0)
		return 0;
	else
		return z;
}

long long POW(long long a, long long n) {
	long long res = 1;
	while(n > 0) {
		if(n & 1) res = res * a;
		a = a * a;
		n >>= 1;
	}
	return res;
}

template <class T>
int sgn(T x) {	//符号関数
	if(x < 0) return -1;
	if(x == 0) return 0;
	return 1;
}

long long modpow(long long a, long long n, long long mod) {	 // a^n mod
	if(mod == 1) return 0LL;
	long long res = 1;
	while(n > 0) {
		if(n & 1) res = res * a % mod;
		a = a * a % mod;
		n >>= 1;
	}
	return res;
}

// a * x % mod == __gcd(a,mod)なるxを返す
// a が modの倍数でないことが条件
long long modinv(long long a, long long mod) {
	long long b = mod, u = 1, v = 0;
	while(b) {
		long long t = a / b;
		a -= t * b;
		swap(a, b);
		u -= t * v;
		swap(u, v);
	}
	u %= mod;
	if(u < 0) u += mod;
	return u;
}

vvll comb(100, vll(100, -1));
long long com(long long n, long long k) {  //普通の二項計数(overflowに注意)
	assert(n < 100 && k < 100);
	if(n < k || k < 0 || n < 0) return 0;
	if(comb[n][k] != -1) return comb[n][k];
	ll res;
	if(n - k < k)
		res = com(n, n - k);
	else if(k == 0)
		res = 1;
	else
		res = com(n - 1, k - 1) + com(n - 1, k);
	comb[n][k] = res;
	return res;
}

// nCk modを求める
const ll MAX = 5100000;
// この値は求める二項計数の値に応じて変える
// MAX=3*10^7のとき1900msほど、ほぼ比例
// MAX=5*10^6程度ならそれほど気にしなくてよい(300ms程)
long long fac[MAX], finv[MAX], inv[MAX];

void cominit() {
	// テーブルを作る前処理
	fac[0] = fac[1] = 1;
	finv[0] = finv[1] = 1;
	inv[1] = 1;
	for(ll i = 2; i < MAX; i++) {
		fac[i] = fac[i - 1] * i % mod;
		inv[i] = mod - inv[mod % i] * (mod / i) % mod;
		finv[i] = finv[i - 1] * inv[i] % mod;
	}
}
long long commod(ll n, ll k) {	// 二項係数計算
	if(n < k) return 0;
	if(n < 0 || k < 0) return 0;
	return fac[n] * (finv[k] * finv[n - k] % mod) % mod;
}
long long pmod(ll n, ll k) {  //順列計算
	if(n < k) return 0;
	if(n < 0 || k < 0) return 0;
	return fac[n] * finv[n - k] % mod;
}
long long hmod(ll n, ll k) {  // nHk計算
	// n個の区別しないoを区別するk個の箱に入れる方法の総数
	//(n+k-1)C(k-1)と等しい
	return commod(n + k - 1, n);
}
#pragma endregion

#pragma region input
#define VEC(type, name, size) \
	vector<type> name(size);  \
	INPUT(name)
#define VVEC(type, name, h, w)                     \
	vector<vector<type>> name(h, vector<type>(w)); \
	INPUT(name)
#define INT(...)     \
	int __VA_ARGS__; \
	INPUT(__VA_ARGS__)
#define LL(...)            \
	long long __VA_ARGS__; \
	INPUT(__VA_ARGS__)
#define STR(...)        \
	string __VA_ARGS__; \
	INPUT(__VA_ARGS__)
#define CHAR(...)     \
	char __VA_ARGS__; \
	INPUT(__VA_ARGS__)
#define DOUBLE(...)     \
	double __VA_ARGS__; \
	INPUT(__VA_ARGS__)
#define LD(...)              \
	long double __VA_ARGS__; \
	INPUT(__VA_ARGS__)

template <class T>
void scan(T &a) {
	cin >> a;
}
template <class T>
void scan(vector<T> &a) {
	for(auto &i : a) scan(i);
}
template <class T, class L>
void scan(pair<T, L> &p) {
	scan(p.first);
	scan(p.second);
}
void INPUT() {}
template <class Head, class... Tail>
void INPUT(Head &head, Tail &... tail) {
	scan(head);
	INPUT(tail...);
}
template <class T>
inline void print(T x) {
	cout << x << '\n';
}

template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
	is >> p.first >> p.second;
	return is;
}
#pragma endregion

#pragma region debug

#pragma region output
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
	os << p.first << " " << p.second;
	return os;
}
template <class T>
ostream &operator<<(ostream &os, const vector<T> &v) {
	for(int i = 0; i < (int)v.size(); i++) {
		if(i) os << " ";
		os << v[i];
	}
	return os;
}
#pragma endregion

#pragma region view

template <typename T>
void view(const T e) {
	std::cerr << e;
}

template <typename T, typename U>
void view(const std::pair<T, U> &p) {
	std::cerr << "(";
	view(p.first);
	cerr << ", ";
	view(p.second);
	cerr << ")";
}

template <typename T>
void view(std::set<T> &s) {
	if(s.empty()) {
		cerr << "{ }";
		return;
	}
	std::cerr << "{ ";
	for(auto &t : s) {
		view(t);
		std::cerr << ", ";
	}
	std::cerr << "\b\b }";
}

template <typename T>
void view(const std::vector<T> &v) {
	if(v.empty()) {
		cerr << "{ }";
		return;
	}
	std::cerr << "{ ";
	for(const auto &e : v) {
		view(e);
		std::cerr << ", ";
	}
	std::cerr << "\b\b }";
}

template <typename T>
void view(const std::vector<std::vector<T>> &vv) {
	std::cerr << "{\n";
	for(const auto &v : vv) {
		std::cerr << "\t";
		view(v);
		cerr << "\n";
	}
	std::cerr << "}";
}

template <typename T, typename U>
void view(const std::vector<std::pair<T, U>> &v) {
	std::cerr << "{\n";
	for(const auto &c : v) {
		std::cerr << "\t(";
		view(c.first);
		cerr << ", ";
		view(c.second);
		cerr << ")\n";
	}
	std::cerr << "}";
}

template <typename T, typename U>
void view(const std::map<T, U> &m) {
	std::cerr << "{\n";
	for(auto &t : m) {
		std::cerr << "\t[";
		view(t.first);
		cerr << "] : ";
		view(t.second);
		cerr << "\n";
	}
	std::cerr << "}";
}

#pragma endregion

// when debugging : g++ foo.cpp -DLOCAL
#ifdef LOCAL
void debug_out() {}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
	view(H);
	cerr << ", ";
	debug_out(T...);
}
#define debug(...)                                           \
	do {                                                     \
		cerr << __LINE__ << " [" << #__VA_ARGS__ << "] : ["; \
		debug_out(__VA_ARGS__);                              \
		cerr << "\b\b]\n";                                   \
	} while(0)
#define dump(x)                                 \
	do {                                        \
		cerr << __LINE__ << " " << #x << " : "; \
		view(x);                                \
		cerr << "\n";                           \
	} while(0)
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

#pragma endregion

//////////////// 幾何 /////////////////
#pragma region geometry
using Real = long double;  //時間がかかる割にdoubleと大差ない
using Point = complex<Real>;
const Real EPS = 1e-10, /*1e-8はたまに落ちる*/ PI = acos(-1);

inline bool eq(Real a, Real b) { return fabs(b - a) < EPS; }  //誤差無視の等式

//実スカラー倍
Point operator*(const Point &p, const Real &d) { return Point(real(p) * d, imag(p) * d); }

// point入力受け取り
istream &operator>>(istream &is, Point &p) {
	Real a, b;
	is >> a >> b;
	p = Point(a, b);
	return is;
}
// point出力
ostream &operator<<(ostream &os, Point &p) { return os << fixed << setprecision(10) << p.real() << " " << p.imag(); }

// 点 p を反時計回りに theta 回転
Point rotate(Real theta, const Point &p) {
	return Point(cos(theta) * p.real() - sin(theta) * p.imag(), sin(theta) * p.real() + cos(theta) * p.imag());
}

Real radian_to_degree(Real r) { return (r * 180.0 / PI); }

Real degree_to_radian(Real d) { return (d * PI / 180.0); }

// a-b-c の角度のうち小さい方を返す
Real get_angle(const Point &a, const Point &b, const Point &c) {
	const Point v(a - b), /* もとはv(b-a)になってたので修正 */ w(c - b);
	Real alpha = atan2(v.imag(), v.real()), beta = atan2(w.imag(), w.real());
	if(alpha > beta) swap(alpha, beta);
	Real theta = (beta - alpha);
	return min(theta, 2 * acos(-1) - theta);
}

namespace std {
bool operator<(const Point &a, const Point &b) { return a.real() != b.real() ? a.real() < b.real() : a.imag() < b.imag(); }
}  // namespace std

struct Line {
	Point a, b;

	Line() = default;

	Line(Point a, Point b) : a(a), b(b) {}

	Line(Real A, Real B, Real C)  // Ax + By = C
	{
		if(eq(A, 0))
			a = Point(0, C / B), b = Point(1, C / B);
		else if(eq(B, 0))
			b = Point(C / A, 0), b = Point(C / A, 1);
		else
			a = Point(0, C / B), b = Point(C / A, 0);
	}

	friend ostream &operator<<(ostream &os, Line &p) { return os << p.a << " to " << p.b; }

	friend istream &operator>>(istream &is, Line &a) { return is >> a.a >> a.b; }
};

struct Segment : Line {
	Segment() = default;

	Segment(Point a, Point b) : Line(a, b) {}
};

struct Circle {
	Point p;
	Real r;

	Circle() = default;

	Circle(Point p, Real r) : p(p), r(r) {}
};

using Points = vector<Point>;
using Polygon = vector<Point>;
using Segments = vector<Segment>;
using Lines = vector<Line>;
using Circles = vector<Circle>;

//外積
Real cross(const Point &a, const Point &b) { return real(a) * imag(b) - imag(a) * real(b); }
//内積
Real dot(const Point &a, const Point &b) { return real(a) * real(b) + imag(a) * imag(b); }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_1_C
// 点の回転方向
int ccw(const Point &a, Point b, Point c) {
	b = b - a, c = c - a;
	if(cross(b, c) > EPS) return +1;   // "COUNTER_CLOCKWISE"
	if(cross(b, c) < -EPS) return -1;  // "CLOCKWISE"
	if(dot(b, c) < 0) return +2;	   // "ONLINE_BACK"
	if(norm(b) < norm(c)) return -2;   // "ONLINE_FRONT"
	return 0;						   // "ON_SEGMENT"
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_2_A
// 平行判定
bool parallel(const Line &a, const Line &b) { return eq(cross(a.b - a.a, b.b - b.a), 0.0); }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_2_A
// 垂直判定
bool orthogonal(const Line &a, const Line &b) { return eq(dot(a.a - a.b, b.a - b.b), 0.0); }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_1_A
// 射影
// 直線 l に p から垂線を引いた交点を求める
Point projection(const Line &l, const Point &p) {
	double t = dot(p - l.a, l.a - l.b) / norm(l.a - l.b);
	return l.a + (l.a - l.b) * t;
}

Point projection(const Segment &l, const Point &p) {
	double t = dot(p - l.a, l.a - l.b) / norm(l.a - l.b);
	return l.a + (l.a - l.b) * t;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_1_B
// 反射
// 直線 l を対称軸として点 p  と線対称にある点を求める
Point reflection(const Line &l, const Point &p) { return p + (projection(l, p) - p) * 2.0; }

bool intersect(const Line &l, const Point &p) { return abs(ccw(l.a, l.b, p)) != 1; }

bool intersect(const Line &l, const Line &m) { return abs(cross(l.b - l.a, m.b - m.a)) > EPS || abs(cross(l.b - l.a, m.b - l.a)) < EPS; }

bool intersect(const Segment &s, const Point &p) { return ccw(s.a, s.b, p) == 0; }

bool intersect(const Line &l, const Segment &s) { return cross(l.b - l.a, s.a - l.a) * cross(l.b - l.a, s.b - l.a) < EPS; }

Real distance(const Line &l, const Point &p);

bool intersect(const Circle &c, const Line &l) { return distance(l, c.p) <= c.r + EPS; }

bool intersect(const Circle &c, const Point &p) { return abs(abs(p - c.p) - c.r) < EPS; }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_2_B
// 線分同士の交差判定　(端点が他方の線分上にあるならば交差とみなす)
bool intersect(const Segment &s, const Segment &t) {
	return ccw(s.a, s.b, t.a) * ccw(s.a, s.b, t.b) <= 0 && ccw(t.a, t.b, s.a) * ccw(t.a, t.b, s.b) <= 0;
}

int intersect(const Circle &c, const Segment &l) {
	if(norm(projection(l, c.p) - c.p) - c.r * c.r > EPS) return 0;
	auto d1 = abs(c.p - l.a), d2 = abs(c.p - l.b);
	if(d1 < c.r + EPS && d2 < c.r + EPS) return 0;
	if(d1 < c.r - EPS && d2 > c.r + EPS || d1 > c.r + EPS && d2 < c.r - EPS) return 1;
	const Point h = projection(l, c.p);
	if(dot(l.a - h, l.b - h) < 0) return 2;
	return 0;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_A&lang=jp
int intersect(Circle c1, Circle c2) {
	if(c1.r < c2.r) swap(c1, c2);
	Real d = abs(c1.p - c2.p);
	if(c1.r + c2.r < d) return 4;	  // 外に離れている
	if(eq(c1.r + c2.r, d)) return 3;  // 外接
	if(c1.r - c2.r < d) return 2;	  // 交差
	if(eq(c1.r - c2.r, d)) return 1;  // 内接
	return 0;						  // 内包
}

Real distance(const Point &a, const Point &b) { return abs(a - b); }

Real distance(const Line &l, const Point &p) { return abs(p - projection(l, p)); }

Real distance(const Line &l, const Line &m) { return intersect(l, m) ? 0 : distance(l, m.a); }

Real distance(const Segment &s, const Point &p) {
	Point r = projection(s, p);
	if(intersect(s, r)) return abs(r - p);
	return min(abs(s.a - p), abs(s.b - p));
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_2_D
Real distance(const Segment &a, const Segment &b) {
	if(intersect(a, b)) return 0;
	return min({distance(a, b.a), distance(a, b.b), distance(b, a.a), distance(b, a.b)});
}

Real distance(const Line &l, const Segment &s) {
	if(intersect(l, s)) return 0;
	return min(distance(l, s.a), distance(l, s.b));
}

Point crosspoint(const Line &l, const Line &m) {
	Real A = cross(l.b - l.a, m.b - m.a);
	Real B = cross(l.b - l.a, l.b - m.a);
	if(eq(abs(A), 0.0) && eq(abs(B), 0.0)) return m.a;
	return m.a + (m.b - m.a) * B / A;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_2_C
Point crosspoint(const Segment &l, const Segment &m) { return crosspoint(Line(l), Line(m)); }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_D
pair<Point, Point> crosspoint(const Circle &c, const Line l) {
	Point pr = projection(l, c.p);
	Point e = (l.b - l.a) / abs(l.b - l.a);
	if(eq(distance(l, c.p), c.r)) return {pr, pr};
	double base = sqrt(c.r * c.r - norm(pr - c.p));
	return {pr - e * base, pr + e * base};
}

pair<Point, Point> crosspoint(const Circle &c, const Segment &l) {
	Line aa = Line(l.a, l.b);
	if(intersect(c, l) == 2) return crosspoint(c, aa);
	auto ret = crosspoint(c, aa);
	if(dot(l.a - ret.first, l.b - ret.first) < 0)
		ret.second = ret.first;
	else
		ret.first = ret.second;
	return ret;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_E
pair<Point, Point> crosspoint(const Circle &c1, const Circle &c2) {
	Real d = abs(c1.p - c2.p);
	Real a = acos((c1.r * c1.r + d * d - c2.r * c2.r) / (2 * c1.r * d));  // 余弦定理
	Real t = atan2(c2.p.imag() - c1.p.imag(), c2.p.real() - c1.p.real());
	Point p1 = c1.p + Point(cos(t + a) * c1.r, sin(t + a) * c1.r);
	Point p2 = c1.p + Point(cos(t - a) * c1.r, sin(t - a) * c1.r);
	return {p1, p2};
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_F
// "点 p を通る円 c の接線"の接点2つ
pair<Point, Point> tangent(const Circle &c1, const Point &p2) { return crosspoint(c1, Circle(p2, sqrt(norm(c1.p - p2) - c1.r * c1.r))); }

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_G
// 円 c1, c2 の共通接線
Lines tangent(Circle c1, Circle c2) {
	Lines ret;
	if(c1.r < c2.r) swap(c1, c2);
	Real g = norm(c1.p - c2.p);
	if(eq(g, 0)) return ret;
	Point u = (c2.p - c1.p) / sqrt(g);
	Point v = rotate(PI * 0.5, u);
	for(int s : {-1, 1}) {
		Real h = (c1.r + s * c2.r) / sqrt(g);
		if(eq(1 - h * h, 0)) {
			ret.emplace_back(c1.p + u * c1.r, c1.p + (u + v) * c1.r);
		} else if(1 - h * h > 0) {
			Point uu = u * h, vv = v * sqrt(1 - h * h);
			ret.emplace_back(c1.p + (uu + vv) * c1.r, c2.p - (uu + vv) * c2.r * s);
			ret.emplace_back(c1.p + (uu - vv) * c1.r, c2.p - (uu - vv) * c2.r * s);
		}
	}
	return ret;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_3_B
// 凸性判定 (反時計回り)
bool is_convex(const Polygon &p) {
	int n = (int)p.size();
	for(int i = 0; i < n; i++) {
		if(ccw(p[(i + n - 1) % n], p[i], p[(i + 1) % n]) == -1) return false;
	}
	return true;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_4_A
// 凸包
Polygon convex_hull(Polygon &p) {
	int n = (int)p.size(), k = 0;
	if(n <= 2) return p;
	sort(p.begin(), p.end());  // x -> yの順にソート
	vector<Point> ch(2 * n);
	for(int i = 0; i < n; ch[k++] = p[i++]) {  //下半分を構成
		while(k >= 2 && cross(ch[k - 1] - ch[k - 2], p[i] - ch[k - 1]) < EPS) --k;
	}
	for(int i = n - 2, t = k + 1; i >= 0; ch[k++] = p[i--]) {  //上半分を構成
		while(k >= t && cross(ch[k - 1] - ch[k - 2], p[i] - ch[k - 1]) < EPS) --k;
	}
	ch.resize(k - 1);
	return ch;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_3_C
// 多角形と点の包含判定
enum { OUT, ON, IN };

int contains(const Polygon &Q, const Point &p) {
	bool in = false;
	for(int i = 0; i < Q.size(); i++) {
		Point a = Q[i] - p, b = Q[(i + 1) % Q.size()] - p;
		if(a.imag() > b.imag()) swap(a, b);
		if(a.imag() <= 0 && 0 < b.imag() && cross(a, b) < 0) in = !in;
		if(cross(a, b) == 0 && dot(a, b) <= 0) return ON;
	}
	return in ? IN : OUT;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1033
// 線分の重複除去
void merge_segments(vector<Segment> &segs) {
	auto merge_if_able = [](Segment &s1, const Segment &s2) {
		if(abs(cross(s1.b - s1.a, s2.b - s2.a)) > EPS) return false;
		if(ccw(s1.a, s2.a, s1.b) == 1 || ccw(s1.a, s2.a, s1.b) == -1) return false;
		if(ccw(s1.a, s1.b, s2.a) == -2 || ccw(s2.a, s2.b, s1.a) == -2) return false;
		s1 = Segment(min(s1.a, s2.a), max(s1.b, s2.b));
		return true;
	};

	for(int i = 0; i < segs.size(); i++) {
		if(segs[i].b < segs[i].a) swap(segs[i].a, segs[i].b);
	}
	for(int i = 0; i < segs.size(); i++) {
		for(int j = i + 1; j < segs.size(); j++) {
			if(merge_if_able(segs[i], segs[j])) {
				segs[j--] = segs.back(), segs.pop_back();
			}
		}
	}
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1033
// 線分アレンジメント
// 任意の2線分の交点を頂点としたグラフを構築する
vector<vector<int>> segment_arrangement(vector<Segment> &segs, vector<Point> &ps) {
	vector<vector<int>> g;
	int N = (int)segs.size();
	for(int i = 0; i < N; i++) {
		ps.emplace_back(segs[i].a);
		ps.emplace_back(segs[i].b);
		for(int j = i + 1; j < N; j++) {
			const Point p1 = segs[i].b - segs[i].a;
			const Point p2 = segs[j].b - segs[j].a;
			if(eq(cross(p1, p2), 0)) continue;	// " == 0" となっていたのを訂正
			if(intersect(segs[i], segs[j])) {
				ps.emplace_back(crosspoint(segs[i], segs[j]));
			}
		}
	}
	sort(begin(ps), end(ps));
	ps.erase(unique(begin(ps), end(ps)), end(ps));	// これ誤差とか大丈夫なのか？

	int M = (int)ps.size();
	g.resize(M);
	for(int i = 0; i < N; i++) {
		vector<int> vec;
		for(int j = 0; j < M; j++) {
			if(intersect(segs[i], ps[j])) {
				vec.emplace_back(j);
			}
		}
		for(int j = 1; j < vec.size(); j++) {
			g[vec[j - 1]].push_back(vec[j]);
			g[vec[j]].push_back(vec[j - 1]);
		}
	}
	return (g);
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_4_C
// 凸多角形の切断
// 直線 l.a-l.b で切断しその左側にできる凸多角形を返す
Polygon convex_cut(const Polygon &U, Line l) {
	Polygon ret;
	for(int i = 0; i < U.size(); i++) {
		Point now = U[i], nxt = U[(i + 1) % U.size()];
		if(ccw(l.a, l.b, now) != -1) ret.push_back(now);
		if(ccw(l.a, l.b, now) * ccw(l.a, l.b, nxt) < 0) {
			ret.push_back(crosspoint(Line(now, nxt), l));
		}
	}
	return (ret);
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_3_A
// 多角形の面積
Real area(const Polygon &p) {
	Real A = 0;
	for(int i = 0; i < p.size(); ++i) {
		A += cross(p[i], p[(i + 1) % p.size()]);
	}
	return A * 0.5;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_7_H
// 円と多角形の共通部分の面積
Real area(const Polygon &p, const Circle &c) {
	if(p.size() < 3) return 0.0;
	function<Real(Circle, Point, Point)> cross_area = [&](const Circle &c, const Point &a, const Point &b) {
		Point va = c.p - a, vb = c.p - b;
		Real f = cross(va, vb), ret = 0.0;
		if(eq(f, 0.0)) return ret;
		if(max(abs(va), abs(vb)) < c.r + EPS) return f;
		if(distance(Segment(a, b), c.p) > c.r - EPS) return c.r * c.r * arg(vb * conj(va));	 // 0.5倍してなくない？
		auto u = crosspoint(c, Segment(a, b));
		vector<Point> tot{a, u.first, u.second, b};
		for(int i = 0; i + 1 < tot.size(); i++) {
			ret += cross_area(c, tot[i], tot[i + 1]);
		}
		return ret;
	};
	Real A = 0;
	for(int i = 0; i < p.size(); i++) {
		A += cross_area(c, p[i], p[(i + 1) % p.size()]);
	}
	return A * 0.5;	 // 0.5倍が抜けていたので修正;
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_4_B
// 凸多角形の直径(最遠頂点対間距離)
Real convex_diameter(const Polygon &p) {
	int N = (int)p.size();
	int is = 0, js = 0;
	for(int i = 1; i < N; i++) {
		if(p[i].imag() > p[is].imag()) is = i;
		if(p[i].imag() < p[js].imag()) js = i;
	}
	Real maxdis = norm(p[is] - p[js]);

	int maxi, maxj, i, j;
	i = maxi = is;
	j = maxj = js;
	do {
		if(cross(p[(i + 1) % N] - p[i], p[(j + 1) % N] - p[j]) >= 0) {
			j = (j + 1) % N;
		} else {
			i = (i + 1) % N;
		}
		if(norm(p[i] - p[j]) > maxdis) {
			maxdis = norm(p[i] - p[j]);
			maxi = i;
			maxj = j;
		}
	} while(i != is || j != js);
	return sqrt(maxdis);
}

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=CGL_5_A
// 最近点対
Real closest_pair(Points ps) {
	if(ps.size() <= 1) throw(0);
	sort(begin(ps), end(ps));  // xでソート

	auto compare_y = [&](const Point &a, const Point &b) { return imag(a) < imag(b); };
	vector<Point> beet(ps.size());
	const Real INF = 1e18;

	function<Real(int, int)> rec = [&](int left, int right) {
		if(right - left <= 1) return INF;
		int mid = (left + right) >> 1;
		auto x = real(ps[mid]);	 // 領域内でx座標真中の点
		auto ret = min(rec(left, mid), rec(mid, right));
		// y座標でソートされた2つの区間をマージ
		inplace_merge(begin(ps) + left, begin(ps) + mid, begin(ps) + right, compare_y);
		int ptr = 0;
		for(int i = left; i < right; i++) {
			if(abs(real(ps[i]) - x) >= ret) continue;
			for(int j = 0; j < ptr; j++) {
				auto luz = ps[i] - beet[ptr - j - 1];
				if(imag(luz) >= ret) break;
				ret = min(ret, abs(luz));
			}
			beet[ptr++] = ps[i];
		}
		return ret;
	};
	return rec(0, (int)ps.size());
}

// (aからの距離):(bからの距離) = dist_a : dist_b となる点の集合(円)を返す
Circle Apollonius_Circle(Point a, Point b, Real dist_a, Real dist_b) {
	assert(!eq(dist_a, dist_b));  //同じ場合はbisectionで
	Real asq = dist_a * dist_a, bsq = dist_b * dist_b;
	Point p = (a * bsq - b * asq) * (1 / (bsq - asq));
	Real r = abs(a - b) * dist_a * dist_b / abs(asq - bsq);
	return Circle(p, r);
}

// 二等分線
Line bisection(Point a, Point b) {
	a = (a + b) * 0.5;
	b = rotate(PI / 2, b - a) + a;
	return Line(a, b);
}

#pragma endregion

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	srand((unsigned)time(NULL));

	INT(n);
	Points pts(n);
	rep(i, n) { cin >> pts[i]; }
	Real ans = dekai;
	auto chk = [&](Point a) {
		Real res = 0;
		rep(i, n) { chmax(res, distance(a, pts[i])); }
		chmin(ans, res);
		return;
	};

	rep(i, n) {
		Rep(j, i + 1, n) {
			Point a = (pts[i] + pts[j]) * 0.5;
			chk(a);
			dump(a);
		}
	}

	rep(i, n) {
		Rep(j, i + 1, n) {
			Rep(k, j + 1, n) {
				auto l = bisection(pts[i], pts[j]);
				auto m = bisection(pts[i], pts[k]);
				if(parallel(l, m)) continue;
				Point p = crosspoint(l, m);
				chk(p);
				dump(p);
			}
		}
	}
	drop(ans);

	return 0;
}


Measured memory_bytes: 4268