#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using namespace atcoder;

#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(n) for(int i = 0; i < (int)(n); ++i)
#define rep2(i, n) for(int i = 0; i < (int)(n); ++i)
#define rep3(i, a, b) for(int i = (a); i < (int)(b); ++i)
#define rep4(i, a, b, c) for(int i = (a); i < (int)(b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)

#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; --i)
#define ALL(a) a.begin(), a.end()
#define Sort(a) sort(a.begin(), a.end())
#define RSort(a) sort(a.rbegin(), a.rend())

typedef long long int ll;
typedef unsigned long long ul;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<char> vc;
typedef vector<string> vst;
typedef vector<double> vd;
typedef vector<long double> vld;
typedef pair<long long, long long> P;

template<class T> long long sum(const T& a){ return accumulate(a.begin(), a.end(), 0LL); }
template<class T> auto min(const T& a){ return *min_element(a.begin(), a.end()); }
template<class T> auto max(const T& a){ return *max_element(a.begin(), a.end()); }

const long long MINF = 0x7fffffffffff;
const long long INF = 0x1fffffffffffffff;
const long long MOD = 1000000007;
const long double EPS = 1e-9;
const long double PI = acos(-1);
 
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

template<typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p){ is >> p.first >> p.second; return is; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &p){ os << "(" << p.first << ", " << p.second << ")"; return os; }
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for(T &in : v) is >> in; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &v){ for(int i = 0; i < (int) v.size(); ++i){ os << v[i] << (i + 1 != (int) v.size() ? " " : ""); } return os; }
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp){ for(auto &[key, val] : mp){ os << key << ":" << val << " "; } return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, queue<T> q){ while(q.size()){ os << q.front() << " "; q.pop(); } return os; }
template <typename T> ostream &operator<<(ostream &os, deque<T> q){ while(q.size()){ os << q.front() << " "; q.pop_front(); } return os; }
template <typename T> ostream &operator<<(ostream &os, stack<T> st){ while(st.size()){ os << st.top() << " "; st.pop(); } return os; }
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq){ while(pq.size()){ os << pq.top() << " "; pq.pop(); } return os; }

template<class T, class U> inline T vin(T& vec, U n) { vec.resize(n); for(int i = 0; i < (int) n; ++i) cin >> vec[i]; return vec; }
template<class T> inline void vout(T vec, string s = "\n"){ for(auto x : vec) cout << x << s; }
template<class... T> void in(T&... a){ (cin >> ... >> a); }
void out(){ cout << '\n'; }
template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
template<class T, class U> void inGraph(vector<vector<T>>& G, U n, U m, bool directed = false){ G.resize(n); for(int i = 0; i < m; ++i){ int a, b; cin >> a >> b; a--, b--; G[a].push_back(b); if(!directed) G[b].push_back(a); } }

template <int char_size, int base>
struct Trie {
    struct Node {            // 頂点を表す構造体
        vector<int> next;    // 子の頂点番号を格納。存在しなければ-1
        vector<int> accept;  // 末端がこの頂点になる単語の word_id を保存
        int c;               // base からの間隔をint型で表現したもの
        int common;          // いくつの単語がこの頂点を共有しているか
        Node(int c_) : c(c_), common(0) {
            next.assign(char_size, -1);
        }
    };
    vector<Node> nodes;  // trie 木本体
    int root;
    Trie() : root(0) {
        nodes.push_back(Node(root));
    }
    // 単語の挿入
    void insert(const string &word, int word_id) {
        int node_id = 0;
        for (int i = 0; i < (int)word.size(); i++) {
            int c = (int)(word[i] - base);
            int &next_id = nodes[node_id].next[c];
            if (next_id == -1) {  // 次の頂点が存在しなければ追加
                next_id = (int)nodes.size();
                nodes.push_back(Node(c));
            }
            ++nodes[node_id].common;
            node_id = next_id;
        }
        ++nodes[node_id].common;
        nodes[node_id].accept.push_back(word_id);
    }
    void insert(const string &word) {
        insert(word, nodes[0].common);
    }
    // 単語とprefixの検索
    bool search(const string &word, bool prefix = false) {
        int node_id = 0;
        for (int i = 0; i < (int)word.size(); i++) {
            int c = (int)(word[i] - base);
            int &next_id = nodes[node_id].next[c];
            if (next_id == -1) {  // 次の頂点が存在しなければ終了
                return false;
            }
            node_id = next_id;
        }
        return (prefix) ? true : nodes[node_id].accept.size() > 0;
    }
    // prefix を持つ単語が存在するかの検索
    bool start_with(const string &prefix) {
        return search(prefix, true);
    }
    // 挿入した単語の数
    int count() const {
        return (nodes[0].common);
    }
    // Trie木のノード数
    int size() const {
        return ((int)nodes.size());
    }
};

ll n, k;

vst s;

void input(){
    in(n, k);
    vin(s, n);
}
 
void solve(){
    Trie<5, '0'> trie;
    rep(i, n){
        trie.insert(s[i]);
    }
    ll ans = 0;
    map<string, ll> mp;
    rep(i, n){
        if(mp.count(s[i]) == 1){
            ans++;
            continue;
        }
        mp[s[i]]++;
        vst t1 = {""};
        rep(j, k){
            vst t2;
            rep(l, s[i][j] - '0', 5){
                char c = '0' + l;
                for(auto x : t1){
                    x += c;
                    if(trie.start_with(x)){
                        t2.push_back(x);
                    }
                }
            }
            swap(t1, t2);
        }
        if(t1.size() >= 2) ans++;
    }
    out(ans);
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    input();
    solve();
}