Baekjoon #1034

import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        FastReader rd = new FastReader();
        int N = rd.nextInt();
        int M = rd.nextInt();

        String a[] = new String[N];

        for (int i = 0; i < N; i++) {
            a[i] = rd.next();
        }

        int K = rd.nextInt();

        boolean visited[] = new boolean[N];
        int ans = 0;
        for (int i = 0; i < N; i++) {
            if (visited[i]) continue;

            visited[i] = true;
            int cnt = 0;
            for (int j = 0; j < M; j++) {
                if (a[i].charAt(j) == '0') cnt++;
            }

            if (cnt <= K && cnt % 2 == K % 2) {
                int max = 0;
                for (int j = 0; j < N; j++) {
                    if (a[i].equals(a[j])) {
                        visited[j] = true;
                        max++;
                    }
                }
                ans = Math.max(max, ans);
            }
        }

        System.out.println(ans);
    }

    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}