#include<iostream>
#include<cstdio>

struct P{
	double x, y;
};

int main(){
	const int MAX_N = 100;
	const double EPS = 1e-9;

	int n;
	while(std::cin >> n, n){
		P ps[MAX_N];
		for(int i=0;i<n;i++){
			scanf("%lf,%lf", &ps[i].x, &ps[i].y);
		}
		int ol[MAX_N];
		for(int i=0;i<MAX_N;i++){
			ol[i] = 0;
		}
		for(int i=0;i<n;i++){
			for(int j=i+1;j<n;j++){
				P p1 = ps[i], p2 = ps[j];
				double x_diff = p1.x - p2.x,
					y_diff = p1.y - p2.y,
					s_dist = x_diff*x_diff + y_diff*y_diff;
				if(s_dist - 4 < EPS){
					ol[i]++;
					ol[j]++;
				}
			}
		}

		int max_ol = 0;
		for(int i=0;i<n;i++){
			max_ol = std::max(max_ol, ol[i]);
		}

		std::cout << max_ol+1 << std::endl;
	}
}