#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, h, m;
  int cash[2360] = {0};
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%d %d", &h, &m);
    h *= 100;
    h += m;
    cash[h]++;
  }
  sort(cash, cash + 2360, greater<int>());
  printf("%d\n", cash[0]);
  return 0;
}
