#include <bits/stdc++.h>
using namespace std;
double x[100], y[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]);
    int res = 0;
    for (int i = 0; i < n; ++i) {
      int c = 1;
      for (int j = 0; j < n; ++j) {
        if (j == i) continue;
        double d = sqrt(pow(x[i] - x[j], 2) + pow(y[i] - y[j], 2));
        if (d <= 2) c++;
      }
      if (res < c) res = c;
    }
    printf("%d\n", res);
  }
  return 0;
}
