1 # include <bits/stdc++.h>
 2 using namespace std;
 3 const double eps = 1e-6;
 4 
 5 struct Point
 6 {
 7     double x;
 8     double y;
 9 }p[305];
10 
11 double dis2(Point a, Point b)
12 {
13     return (b.y - a.y) * (b.y - a.y) + (b.x - a.x) * (b.x - a.x);
14 }
15 
16 Point center(Point a, Point b)
17 {
18     Point aa, bb, mid;
19     aa.x = b.x - a.x;
20     aa.y = b.y - a.y;
21     mid.x = (a.x + b.x) / 2;
22     mid.y = (a.y + b.y) / 2;
23     double c = sqrt(1.0 - dis2(a, mid));
24     if(fabs(aa.y) < eps)
25     {
26         bb.x = mid.x;
27         bb.y = mid.y + c;
28     }
29     else
30     {
31         double ang = atan(-aa.x / aa.y);
32         bb.x = mid.x + c * cos(ang);
33         bb.y = mid.y + c * sin(ang);
34     }
35     return bb;
36 }
37 
38 int main()
39 {
40     int T;
41     scanf("%d", &T);
42     while(T--)
43     {
44         int n;
45         scanf("%d", &n);
46         for(int i = 0; i < n; i++)
47         {
48             scanf("%lf%lf", &p[i].x, &p[i].y);
49         }
50         Point cen;
51         int ans = 1, tep;
52         for(int i = 0; i < n; i++)
53         {
54             for(int j = i + 1; j < n; j++)
55             {
56                 if(dis2(p[i], p[j]) > 4)
57                     continue;
58                 cen = center(p[i], p[j]);
59                 tep = 0;
60                 for(int k = 0; k < n; k++)
61                 {
62                     if(dis2(p[k], cen) <= 1 + eps)
63                         tep++;
64                 }
65                 if(ans < tep)
66                     ans = tep;
67             }
68         }
69         printf("%d\n", ans);
70     }
71     
72     
73     return 0;
74 }