#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define mod3 100000007
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vb vector<bool>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvb vector<vector<bool>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int,int>
#define pil pair<int,ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int,int>>
#define vpll vector<pair<ll,ll>>
#define vvpii vector<vector<pair<int,int>>>
#define vvpll vector<vector<pair<ll,ll>>>

template<typename T> void debug(T e){
    cerr << e << endl;
}

template<typename T> void debug(vector<T> &v){
    rep(i, v.size()){
        cerr << v[i] << " ";
    }
    cerr << endl;
}

template<typename T> void debug(vector<vector<T>> &v){
    rep(i, v.size()){
        rep(j, v[i].size()){
            cerr << v[i][j] << " ";
        }
        cerr << endl;
    }
}

template<typename T> void debug(vector<pair<T, T>> &v){
    rep(i,v.size()){
        cerr << v[i].first << " " << v[i].second << endl;
    }
}

template<typename T> void debug(set<T> &st){
    for (auto itr = st.begin(); itr != st.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(multiset<T> &ms){
    for (auto itr = ms.begin(); itr != ms.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(map<T, T> &mp){
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        cerr << itr->first << " " << itr->second << endl;
    }
}

void debug_out(){
    cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
    cerr << H << " ";
    debug_out(T...);
}

int stox(string &S){
    int ret = 0;
    int num = 1;
    for (int i = S.size() - 1; i >= 0; i--){
        ret += (int)(S[i] - '0') * num;
        num *= 5;
    }
    return ret;
}

void dfs(vector<bool> &has, vector<int> &vec, int v, int now_num, vector<int> &pow5, int start){
    if (v == vec.size()){
        //debug(now_num);
        if (now_num != start) has[now_num] = false;
        return;
        //debug(now_num);
    }
    for (int i = 0; i <= vec[v]; i++){
        now_num += i * pow5[vec.size() - 1 - v];
        dfs(has, vec, v + 1, now_num, pow5, start);
        now_num -= i * pow5[vec.size() - 1 - v];
    }
}

int main(){
    int N, K;
    cin >> N >> K;
    vector<string> S(N);
    for (int i = 0; i < N; i++){
        cin >> S[i];
    }
    int num = 1;
    for (int i = 0; i < K; i++) num *= 5;
    vector<bool> has(num, false);

    for (int i = 0; i < N; i++){
        //debug(stox(S[i]));
        has[stox(S[i])] = true;
    }
    vector<int> pow5(K, 0);
    pow5[0] = 1;
    for (int i = 0; i < K - 1; i++){
        pow5[i + 1] = pow5[i] * 5;
    }

    for (int i = 0; i < num; i++){
        int div = i;
        vector<int> vec(K, 0);
        for (int j = 0; j < K; j++){
            vec[K - 1 - j] = div % 5;
            div /= 5; 
        }
        //debug(vec);
        if (has[i]){
            dfs(has, vec, 0, 0, pow5, i);
            //cout << i << endl;
        }
    }
    int remain = 0;
    for (int i = 0; i < num; i++){
        if (has[i]) remain++;
    }
    cout << N - remain << endl;
}