#include<iostream>
#include<string>
#include<math.h>
using namespace std;
int main(){
	int n;
	double x[102],y[102];
	char z;
	while(cin>>n){
	    if(n==0)
		    break;
	    for(int i=0;i<n;i++)
		    cin>>x[i]>>z>>y[i];
	    int h=1;
	    for(double i=0.0;i<=10;i+=0.02){
		    for(double j=0.0;j<=10;j+=0.02){
			    int w=0;
			    for(int k=0;k<n;k++){
				    if(sqrt((double)(x[k]-i)*(x[k]-i)+(y[k]-j)*(y[k]-j))<=1){
					    w++;
					}
			    }
			    if(w>h)
				    h=w;
		    }
	    }
		cout<<h<<endl;
	}
	return 0;
}