#include <cstdio>

#include <cmath>

#define N 301

#define eps 1e-5

using namespace std;

int n,ans,tol;

double x[N],y[N],dx,dy;

inline double sqr(double x)

{

    return x*x;

}

inline double dis(int a,int b)

{

    return sqrt((x[a]-x[b])*(x[a]-x[b])+(y[a]-y[b])*(y[a]-y[b]));

}

inline void solve()

{

    tol=;

    for(int i=; i<=n; i++)

        if(dis(,i)<=+eps)

            tol++;

    if(tol>ans)ans=tol;

}

inline void get(int a,int b){

    double v=atan((x[b]-x[a])/(y[a]-y[b]));//等于0时会返回inf，v=pi/2

    double c=sqrt(-sqr(dis(a,b)/2.0));

    dx= c*cos(v);

    dy= c*sin(v);

}

int main()

{

    while(scanf("%d",&n)&&n)

    {

        ans=;

        for (int i=; i<=n; i++)

            scanf("%lf%lf",&x[i],&y[i]);

        for (int i=; i<=n; i++)

            for (int j=i+; j<=n; j++)

            if(dis(i,j)<){

                double mx=(x[i]+x[j])/2.0,my=(y[i]+y[j])/2.0;

                get(i,j);

                x[]=mx+dx,y[]=my+dy;

                solve();

            }

        printf("%d\n",ans);

    }

}