#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;

int main(){
    int N, K; cin >> N >> K;
    vector<int> A(N);
    rep(i,N){
        string S; cin >> S;
        int id = 0;
        for(char c : S) id = id * 5 + '4' - c;
        A[i] = id;
    }
    int K5 = 1; rep(i,K) K5 *= 5;
    vector<int> C(K5);
    rep(i,N) C[A[i]]++;
    for(int k5=1; k5<K5; k5*=5) for(int i=0; i<K5; i+=k5*5) for(int q=i; q<i+k5*4; q+=k5) for(int r=q; r<q+k5; r++) C[r+k5] += C[r];
    int ans = 0;
    rep(i,N) if(C[A[i]] > 1) ans++;
    cout << ans << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;