#include <bits/stdc++.h>
int main() {
  for (int m; std::cin >> m, m;) {
    int l[101], *n = l, i, j, p = m, o = 0;
    double a[101], b[101], *c = a, *d = b;
    for (; m--;) {
      (std::cin >> *c++).ignore() >> *d++;
      *n++ = 1;
    }
    for (i = 0; i < p - 1; i++)
      for (j = i + 1; j < p; j++)
        if ((a[j] - a[i]) * (a[j] - a[i]) + (b[j] - b[i]) * (b[j] - b[i]) <= 4)
          l[i]++, l[j]++;
    for (i = 1; i < p; i++)
      if (l[o] < l[i]) o = i;
    std::cout << l[o] << '\n';
  }
}
