#include <bits/stdc++.h>
using namespace std;
int main() {
  size_t n, m;
  cin >> n >> m;
  vector<string> marks(n);
  for (size_t i = 0; i < n; ++i) {
    cin >> marks[i];
  }
  vector<bool> successful(n, false);
  for (size_t subject = 0; subject < m; ++subject) {
    char best = '0';
    for (size_t i = 0; i < n; ++i) {
      if (marks[i][subject] > best) {
        best = marks[i][subject];
      }
    }
    for (size_t i = 0; i < n; ++i) {
      if (marks[i][subject] == best) {
        successful[i] = true;
      }
    }
  }
  cout << count(successful.begin(), successful.end(), true);
  return 0;
}
