#include<stdio.h>
#include<math.h>
double EPS=1e-9;
double S(double x){return x*x;}
double D(double x1,double y1,double x2,double y2)
{
	return sqrt(S(x1-x2)+S(y1-y2));
}
double x[100],y[100];
int n;
int F(int i,int j,double px,double py)
{
	int t=2,k;
	for(k=0;k<n;++k)if(k-i&&k-j&&D(px,py,x[k],y[k])-EPS<1)++t;
	return t;
}
int main()
{
	double d,dx,dy,t1,t2;
	int i,j,r,t;
	while(scanf("%d",&n),n)
	{
		for(i=r=0;i<n;++i)scanf("%lf,%lf",x+i,y+i);
		for(i=0;i<n;++i)for(j=i+1;j<n;++j)
		{
			dx=x[i]-x[j];dy=y[i]-y[j];
			d=sqrt(dx*dx+dy*dy);
			if(d-EPS>2)continue;
			t1=atan2(dy,dx);
			t2=acos(d/2);
			if((t=F(i,j,x[j]+cos(t1+t2),y[j]+sin(t1+t2)))>r)r=t;
			if((t=F(i,j,x[j]+cos(t1-t2),y[j]+sin(t1-t2)))>r)r=t;
		}
		printf("%d\n",r);
	}
	return 0;
}