#define MOD_TYPE 1

#pragma region Macros
#include <bits/stdc++.h>
using namespace std;
/*
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using multiInt = boost::multiprecision::cpp_int;
using lld = boost::multiprecision::cpp_dec_float_100;
*/
/*
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
*/
using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
template <typename Q_type>
using smaller_queue = priority_queue<Q_type, vector<Q_type>, greater<Q_type>>;

constexpr ll MOD = (MOD_TYPE == 1 ? (ll)(1e9 + 7) : 998244353);
//constexpr ll MOD = 1;
constexpr int INF = (int)1e9;
constexpr ll LINF = (ll)4e18;
constexpr double PI = acos(-1.0);
constexpr double EPS = 1e-8;
constexpr int Dx[] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
constexpr int Dy[] = {1, -1, 0, 0, -1, -1, 1, 1, 0};

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define REPI(i, m, n) for (int i = m; i < (int)(n); ++i)
#define repi(i, n) REPI(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << "\n"
#define possible(n) cout << ((n) ? "possible" : "impossible") << "\n"
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << "\n"
#define Yay(n) cout << ((n) ? "Yay!" : ":(") << "\n"
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << "\n";

inline void init_main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << setprecision(30) << setiosflags(ios::fixed);
}
template <typename T>
inline bool chmin(T &a, T b)
{
  if (a > b)
  {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
inline bool chmax(T &a, T b)
{
  if (a < b)
  {
    a = b;
    return true;
  }
  return false;
}
inline ll CEIL(ll a, ll b)
{
  return (a + b - 1) / b;
}
template <typename A, size_t N, typename T>
inline void Fill(A (&array)[N], const T &val)
{
  fill((T *)array, (T *)(array + N), val);
}
template <typename T, typename U>
constexpr ostream &operator<<(ostream &os, pair<T, U> &p) noexcept
{
  os << p.first << " " << p.second;
  return os;
}
#pragma endregion

using Real = double;
using Point = complex<Real>;

inline bool eq(Real a, Real b) { return fabs(b - a) < EPS; }

Point operator*(const Point &p, const Real &d)
{
  return Point(real(p) * d, imag(p) * d);
}

istream &operator>>(istream &is, Point &p)
{
  Real a, b;
  is >> a >> b;
  p = Point(a, b);
  return is;
}

ostream &operator<<(ostream &os, Point &p)
{
  return os << fixed << setprecision(20) << p.real() << " " << p.imag();
}

// 点 p を反時計回りに theta 回転
inline 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(b - a), 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>;

inline Real cross(const Point &a, const Point &b)
{
  return real(a) * imag(b) - imag(a) * real(b);
}

inline 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
inline 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
inline 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
inline 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;
}

inline 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
inline Point reflection(const Line &l, const Point &p)
{
  return p + (projection(l, p) - p) * 2.0;
}

// pを通りlに垂直な直線
inline Line verticalline(const Line &l, const Point &p)
{
  Real a = imag(l.b) - imag(l.a);
  Real b = real(l.a) - real(l.b);
  return Line(b, -a, a * imag(p) - b * real(p));
}

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

inline 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;
}

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

inline 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;
}

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

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

inline 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
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;
  if (eq(c1.r + c2.r, d))
    return 3;
  if (c1.r - c2.r < d)
    return 2;
  if (eq(c1.r - c2.r, d))
    return 1;
  return 0;
}

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

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

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

inline 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));
  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
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
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());
  vector<Point> ch(2 * n);
  for (int i = 0; i < n; ch[k++] = p[i++])
  {
    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--])
  {
    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 (cross(p1, p2) == 0)
        continue;
      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));

  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));
    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;
}

// 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));

  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]);
    auto ret = min(rec(left, mid), rec(mid, right));
    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());
}

void solve()
{
  int n;
  cin >> n;
  if (n == 0)
    exit(0);
  vector<Point> v(n);
  rep(i, n) cin >> v[i];
  int Max = 0;
  rep(i, n) REP(j, i + 1, n)
  {
    Circle c1(v[i], 1.0), c2(v[j], 1.0);
    int isct = intersect(c1, c2);
    assert(isct != 1);
    if (isct == 0)
      continue;
    Point p1, p2;
    tie(p1, p2) = crosspoint(c1, c2);
    int cnt = 0;
    rep(t, n)
    {
      if (distance(v[t], p1) < 1.0 + EPS)
        cnt++;
    }
    chmax(Max, cnt);
    cnt = 0;
    rep(t, n)
    {
      if (distance(v[t], p2) < 1.0 + EPS)
        cnt++;
    }
    chmax(Max, cnt);
  }
  if (Max == 0)
    Max = 1;
  cout << Max << "\n";
}

int main()
{
  init_main();

  while (1)
  {
    solve();
  }
  return 0;
}


Measured memory_bytes: 3756