#include <bits/stdc++.h>
using namespace std;
const double ESP = 1E-9;
double x[300];
double y[300];
int main() {
  int n;
  while (cin >> n && n) {
    for (int i = 0; i < n; i++) {
      cin >> x[i];
      cin >> y[i];
    }
    int count = 1;
    for (int i = 1; i < n; i++) {
      for (int j = 0; j < i; j++) {
        double dx = x[j] - x[i];
        double dy = y[j] - y[i];
        double mx = (x[j] + x[i]) / 2;
        double my = (y[j] + y[i]) / 2;
        double dis = sqrt(dx * dx + dy * dy);
        if (dis > 2.0) continue;
        double mdis = dis / 2;
        double dis2 = sqrt(1 - mdis * mdis);
        dx /= dis;
        dy /= dis;
        double px[2], py[2];
        px[0] = mx + dis2 * dy;
        px[1] = mx - dis2 * dy;
        py[0] = my - dis2 * dx;
        py[1] = my + dis2 * dx;
        for (int k = 0; k < 2; k++) {
          int c = 0;
          for (int l = 0; l < n; l++) {
            double dx2 = px[k] - x[l];
            double dy2 = py[k] - y[l];
            double dis3 = dx2 * dx2 + dy2 * dy2;
            if (dis3 < 1 + ESP) c++;
          }
          count = max(count, c);
        }
      }
    }
    cout << count << endl;
  }
  return 0;
}
