#include<cstdio>
#include<cstring>
#include<algorithm>
#include<math.h>
using namespace std;
const int N = 300;
struct Point
{
    double x,y;
} p[N];
struct Node
{
    double angle;
    bool in;
} arc[180000];
int n,cnt;
double R;
double dist(Point p1,Point p2)
{
    return sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y));
}
bool cmp(Node n1,Node n2)
{
    return n1.angle!=n2.angle?n1.angle<n2.angle:n1.in>n2.in;
}
void MaxCircleCover()
{
    int ans=1;
    for(int i=0; i<n; i++)
    {
        int cnt=0;
        for(int j=0; j<n; j++)
        {
            if(i==j) continue;
            if(dist(p[i],p[j])>R*2) continue;
            double angle=atan2(p[i].y-p[j].y,p[i].x-p[j].x);
            double phi=acos(dist(p[i],p[j])/2);
            arc[cnt].angle=angle-phi;
            arc[cnt++].in=true;
            arc[cnt].angle=angle+phi;
            arc[cnt++].in=false;
        }
        sort(arc,arc+cnt,cmp);
        int tmp=1;
        for(int i=0; i<cnt; i++)
        {
            if(arc[i].in) tmp++;
            else tmp--;
            ans=max(ans,tmp);
        }
    }
    printf("%d\n",ans);
}
int main()
{
    int tcase;
    scanf("%d",&tcase);
    while(tcase--)
    {
        scanf("%d",&n);
//scanf("%lf",&R);
        R = 1; //此题 R 为 1
        for(int i=0; i<n; i++)
            scanf("%lf%lf",&p[i].x,&p[i].y);
        MaxCircleCover();
    }
    return 0;
}