/* -*- coding: utf-8 -*-
 *
 * 3042.cc:  No.3042 諡｡螟ｧ繧ｳ繝斐・ - yukicoder
 */

#include<cstdio>
#include<cmath>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 1000000;

/* typedef */

template <typename T>
struct Pt {
  T x, y;
  Pt() {}
  Pt(T _x, T _y) : x(_x), y(_y) {}
  Pt(const Pt<T> &p) : x(p.x), y(p.y) {}

  Pt<T> operator+(const Pt<T> p) const { return Pt<T>(x + p.x, y + p.y); }
  Pt<T> operator-() const { return Pt<T>(-x, -y); }
  Pt<T> operator-(const Pt<T> p) const { return Pt<T>(x - p.x, y - p.y); }
  Pt<T> operator*(T t) const { return Pt<T>(x * t, y * t); }
  Pt<T> operator/(T t) const { return Pt<T>(x / t, y / t); }
  T dot(Pt<T> v) const { return x * v.x + y * v.y; }
  T cross(Pt<T> v) const { return x * v.y - y * v.x; }
  Pt<T> mid(const Pt<T> p) { return Pt<T>((x + p.x) / 2, (y + p.y) / 2); }
  T d2() { return x * x + y * y; }
  double d() { return sqrt(d2()); }

  Pt<T> rot(double th) {
    double c = cos(th), s = sin(th);
    return Pt<T>(c * x - s * y, s * x + c * y);
  }

  Pt<T> rot90() { return Pt<T>(-y, x); }

  bool operator==(const Pt<T> pt) const { return x == pt.x && y == pt.y; }
  bool operator<(const Pt<T> &pt) const {
    return x < pt.x || (x == pt.x && y < pt.y);
  }

  void print() { printf("(%d,%d)", x, y); }
};

using pt = Pt<double>;

/* global variables */

pt ps[MAX_N], qs[MAX_N];

/* subroutines */

void readpts(int n, pt ps[]) {
  for (int i = 0; i < n; i++)
    scanf("%lf%lf", &ps[i].x, &ps[i].y);
}

int farthest(int n, pt ps[], int st) {
  double maxd2 = -1, maxi = -1;
  for (int i = 0; i < n; i++)
    if (i != st) {
      double d2 = (ps[i] - ps[st]).d2();
      if (maxd2 < d2) maxd2 = d2, maxi = i;
    }
  return maxi;
}

/* main */

int main() {
  int n;
  scanf("%d", &n);
  readpts(n, ps);
  readpts(n, qs);

  int p0 = farthest(n, ps, 0);
  int p1 = farthest(n, ps, p0);
  int q0 = farthest(n, qs, 0);
  int q1 = farthest(n, qs, p0);

  double pd = (ps[p1] - ps[p0]).d2();
  double qd = (qs[q1] - qs[q0]).d2();

  double r = sqrt(qd / pd);
  printf("%.10lf\n", r);
  
  return 0;
}