#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
	// step #1. input
	int N, K;
	cin >> N >> K;
	vector<string> S(N);
	for (int i = 0; i < N; i++) {
		cin >> S[i];
	}

	// step #2. compute ID number
	vector<int> pow6(K + 1);
	pow6[0] = 1;
	for (int i = 1; i <= K; i++) {
		pow6[i] = pow6[i - 1] * 6;
	}
	vector<int> id(N);
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < K; j++) {
			id[i] += (int(S[i][j] - '0') + 1) * pow6[j];
		}
	}

	// step #3. cumulative sum
	vector<int> sum(pow6[K]);
	for (int i = 0; i < N; i++) {
		sum[id[i]] += 1;
	}
	for (int i = 0; i < K; i++) {
		for (int j = 0; j < pow6[K]; j++) {
			if ((j / pow6[i]) % 6 != 0) {
				sum[j - pow6[i]] += sum[j];
			}
		}
	}

	// step #4. calculate answer
	int answer = 0;
	for (int i = 0; i < N; i++) {
		if (sum[id[i]] >= 2) {
			answer += 1;
		}
	}

	// step #5. output
	cout << answer << endl;

	return 0;
}