#include <cstdio>
#include <cmath>
#include <bitset>
using namespace std;
double x[100], y[100];
bitset<100> bits[100];
int main()
{
	int n;
	while (true) {
		scanf("%d", &n);
		if (n == 0) break;
		for (int i = 0; i < n; ++i) scanf("%lf,%lf", &x[i], &y[i]);
		for (int i = 0; i < n; ++i) bits[i].reset();

		for (int i = 0; i < n; ++i) {
			for (int j = 0; j < n; ++j) {
				double d = (x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]); 
				if (d < 4.000001) bits[i][j] = 1;
			}
		}

		int res = 0;
		for (int i = 0; i < n; ++i) {
			for (int j = i; j < n; ++j)
				if (bits[i][j]) bits[i] &= bits[j];
			if (res < bits[i].count()) res = bits[i].count();
		}
		printf("%d\n", res);
	}
	return 0;
}