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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        int[] base = new int[k];
        base[0] = 1;
        for (int i = 1; i < k; i++) {
            base[i] = base[i - 1] * 5;
        }
        int count = base[k - 1] * 5;
        boolean[] enables = new boolean[count];
        int[] counts = new int[count];
        for (int i = 0; i < n; i++) {
            int mask = 0;
            for (char c : sc.next().toCharArray()) {
                mask *= 5;
                mask += c - '0';
            }
            counts[mask]++;
        }
        int ans = 0;
        for (int i = count - 1; i >= 0; i--) {
            for (int j = 0; j < k && !enables[i]; j++) {
                if (i / base[j] % 5 < 4) {
                    enables[i] = enables[i + base[j]];
                }
            }
            if (enables[i]) {
                ans += counts[i];
            }
            enables[i] |= (counts[i] > 0);
        }
        System.out.println(ans);
    }
    
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}