Problem: You are given a convex polygon P with n distinct vertices p1, p2, ..., pn. Vertex pi has coordinates (xi, yi) in the 2D plane. These vertices are listed in clockwise order.

You can choose a real number D and move each vertex of the polygon a distance of at most D from their original positions.

Find the maximum value of D such that no matter how you move the vertices, the polygon does not intersect itself and stays convex.

Input

The first line has one integer n (4 ≤ n ≤ 1 000) — the number of vertices.

The next n lines contain the coordinates of the vertices. Line i contains two integers xi and yi ( - 109 ≤ xi, yi ≤ 109) — the coordinates of the i-th vertex. These points are guaranteed to be given in clockwise order, and will form a strictly convex polygon (in particular, no three consecutive points lie on the same straight line).

Output

Print one real number D, which is the maximum real number such that no matter how you move the vertices, the polygon stays convex.

Your answer will be considered correct if its absolute or relative error does not exceed 10 - 6.

Namely, let's assume that your answer is a and the answer of the jury is b. The checker program will consider your answer correct if <image>.

Examples

Input

4
0 0
0 1
1 1
1 0


Output

0.3535533906


Input

6
5 0
10 0
12 -4
10 -8
5 -8
3 -4


Output

1.0000000000

Note

Here is a picture of the first sample

<image>

Here is an example of making the polygon non-convex.

<image>

This is not an optimal solution, since the maximum distance we moved one point is  ≈ 0.4242640687, whereas we can make it non-convex by only moving each point a distance of at most  ≈ 0.3535533906.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
class Point {
 public:
  double x, y;
  Point() {}
  Point(double x, double y) : x(x), y(y) {}
  bool operator<(const Point &_se) const {
    return x < _se.x || (x == _se.x && y < _se.y);
  }
  static int sgn(double ta, double tb) {
    if (fabs(ta - tb) < 0.00000001) return 0;
    if (ta < tb) return -1;
    return 1;
  }
  static double xmult(const Point &po, const Point &ps, const Point &pe) {
    return (ps.x - po.x) * (pe.y - po.y) - (pe.x - po.x) * (ps.y - po.y);
  }
  friend Point operator+(const Point &_st, const Point &_se) {
    return Point(_st.x + _se.x, _st.y + _se.y);
  }
  friend Point operator-(const Point &_st, const Point &_se) {
    return Point(_st.x - _se.x, _st.y - _se.y);
  }
  bool operator==(const Point &_off) const {
    return Point::sgn(x, _off.x) == 0 && Point::sgn(y, _off.y) == 0;
  }
  bool operator!=(const Point &_Off) const {
    return ((*this) == _Off) == false;
  }
  static double dis2(const Point &_st, const Point &_se) {
    return (_st.x - _se.x) * (_st.x - _se.x) +
           (_st.y - _se.y) * (_st.y - _se.y);
  }
  static double dis(const Point &_st, const Point &_se) {
    return sqrt((_st.x - _se.x) * (_st.x - _se.x) +
                (_st.y - _se.y) * (_st.y - _se.y));
  }
};
class Line {
 public:
  Point s, e;
  double a, b, c;
  double operator/(const Point &_Off) const {
    return (_Off.y - s.y) * (e.x - s.x) - (_Off.x - s.x) * (e.y - s.y);
  }
  friend double operator/(const Line &_st, const Line &_se) {
    return (_st.e.x - _st.s.x) * (_se.e.y - _se.s.y) -
           (_st.e.y - _st.s.y) * (_se.e.x - _se.s.x);
  }
  friend double operator*(const Line &_st, const Line &_se) {
    return (_st.e.x - _st.s.x) * (_se.e.x - _se.s.x) -
           (_st.e.y - _st.s.y) * (_se.e.y - _se.s.y);
  }
  bool pton() {
    a = e.y - s.y;
    b = s.x - e.x;
    c = e.x * s.y - e.y * s.x;
    return true;
  }
  double dis(const Point &_Off, bool isSegment = false) {
    pton();
    double td = (a * _Off.x + b * _Off.y + c) / sqrt(a * a + b * b);
    if (isSegment) {
      double xp = (b * b * _Off.x - a * b * _Off.y - a * c) / (a * a + b * b);
      double yp = (-a * b * _Off.x + a * a * _Off.y - b * c) / (a * a + b * b);
      double xb = max(s.x, e.x);
      double yb = max(s.y, e.y);
      double xs = s.x + e.x - xb;
      double ys = s.y + e.y - yb;
      if (xp > xb + 0.00000001 || xp < xs - 0.00000001 ||
          yp > yb + 0.00000001 || yp < ys - 0.00000001)
        td = min(Point::dis(_Off, s), Point::dis(_Off, e));
    }
    return fabs(td);
  }
};
Point p[500009];
Line la;
int n;
double ans = 1000000000000.0;
int main() {
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) scanf("%lf%lf", &p[i].x, &p[i].y);
  p[n + 1] = p[1], p[n + 2] = p[2];
  for (int i = 1; i <= n; i++) {
    la.s = p[i], la.e = p[i + 2];
    ans = min(la.dis(p[i + 1]) / 2.0, ans);
  }
  printf("%.10lf\n", ans);
  return 0;
}