#ifndef hari64
#include <bits/stdc++.h>
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#define debug(...)
#else
#include "viewer.hpp"
#define debug(...) viewer::_debug(__LINE__, #__VA_ARGS__, __VA_ARGS__)
#endif  // clang-format off
using namespace std;constexpr int INF=1001001001;constexpr long long INFll=1001001001001001001;
template<class T>bool chmax(T&a,const T&b){return a<b?a=b,1:0;}
template<class T>bool chmin(T&a,const T&b){return a>b?a=b,1:0;}  // clang-format on

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N, K;
    cin >> N >> K;

    set<string> Ss;
    for (int i = 0; i < N; i++) {
        string S;
        cin >> S;
        Ss.insert(S);
    }

    int ans = 0;

    map<string, bool> memo;
    auto dfs = [&](const auto &f, string X) -> bool {
        if (memo.find(X) != memo.end()) return memo[X];
        bool has_larger = false;
        for (int d = 0; d < K; d++) {
            if (X[d] != '4') {
                X[d]++;
                has_larger |= f(f, X);
                X[d]--;
            }
        }
        // debug(X, has_larger);
        if (Ss.find(X) != Ss.end()) {
            if (has_larger) {
                ans++;
            }
            has_larger = true;
        }
        return memo[X] = has_larger;
    };

    dfs(dfs, string(K, '0'));

    cout << ans << endl;

    return 0;
}