#include <stdio.h>
#include <math.h>
int main(void) {
	int n;
	double x[1000];
	double y[1000];
	int count;
	int max=0;
	while (scanf("%d", &n), n) {
		for (int i = 0; i < n; i++) {
			scanf("%lf,%lf", &x[i], &y[i]);
		}
		for (int i = 0; i < n; i++) {
			count = 0;
			for (int j = 0; j < n; j++) {
					if ((x[i] - x[j])*(x[i] - x[j]) + (y[i] - y[j])*(y[i] - y[j]) <= 4.0) {
						count++;
					}
			}
			if (max < count) max = count;
			count = 0;
		}
		printf("%d\n", max);
	}
	return 0;
}