#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
#define rep1(i,n) for(int i=1;i<=n;++i)
#define rrep(i,n) for(int i=n-1;i>=0;--i)
#define debug(output) if(debugFlag)cout<<#output<<"= "<<output<<"\n";
using lint = long long;
typedef pair<int,int> P;
const bool debugFlag=true;
const lint linf=1.1e18;const int inf=1.01e9;
constexpr int MOD=1000000007;
template<class T>bool chmax(T &a, const T &b) { if(a < b){ a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if(a > b){ a = b; return 1; } return 0; }

signed main(){
    int n,k;cin>>n>>k;
    int res=0;
    int m=1;
    rep(i,k)m*=5;
    vector<int> a(m,0);
    rep(i,n){
        string s;cin>>s;
        int x=0;
        for(auto c:s){
            x*=5;
            x+=c-'0';
        }
        a[x]+=1;
    }
    vector<int> dp(m,0);
    for(int status=m-1;status>=0;--status){
        if(dp[status]>0&&a[status]>0){
            ++res;
        }
        if(a[status]>0)dp[status]=1;
        if(dp[status]==0)continue;
        int x=status;
        int base=1;
        rep(_z,k){
            if(x%5>0){
                dp[status-base]=1;
            }
            base*=5;
            x/=5;
        }
    }
    cout<<res<<"\n";
    return 0;
}