#include<iostream>
#include<cmath>

using namespace std;

int main()
{
	double x[128],y[128];
	int n,i,j;
	
	for(;;)
	{
		cin >> n ;
		if(n==0)
			break;
		
		char a;
		int ans=0;
		
		for(i=0;i<n;i++)
			cin >> x[i] >> a >> y[i] ;
		
		for(i=0;i<n;i++)
		{
			int s_ans=0;
			for(j=0;j<n;j++)
			{
				if(2.000000>=sqrt((x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j])))
					s_ans++;
			}
			if(ans<s_ans)
				ans=s_ans;
		}
		cout << ans << endl;
	}
}