package chelper;

import io.InputReader;
import io.OutputWriter;
import misc.SimpleSavingChelperSolution;


public class G extends SimpleSavingChelperSolution {

  public void solve(int testNumber, InputReader in, OutputWriter out) {
    wrapSolve(testNumber, in, out);
  }

  @Override
  public void solve(int testNumber) {
    int n = in.nextInt();

    int[] a = new int[7];


    int max = 0;

    for (int i = 0; i < n; i++) {
      String s = in.nextString();

      for (int j = 0; j < 7; j++) {
        a[j] += s.charAt(j) == '1' ? 1 : 0;
        max = Math.max(max, a[j]);
      }
    }

    out.println(max);
  }
}