#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 2000000000000000005



int main(){
	
	int N,K;
	cin>>N>>K;
	
	int cur = 1;
	rep(i,K)cur *= 5;
	vector a(cur,0);
	
	rep(i,N){
		string t;
		cin>>t;
		int v = 0;
		int cc = 1;
		rep(j,K){
			v += cc * (t[j]-'0');
			cc *= 5;
		}
		a[v] ++;
	}
	vector dp = a;
	cur = 1;
	rep(i,K){
		vector ndp(dp.size(),0);
		rep(j,dp.size()){
			int jj = j/cur % 5;
			for(int k=jj;k<=4;k++){
				ndp[j] += dp[j + cur * (k-jj)];
			}
		}
		swap(dp,ndp);
		cur *= 5;
	}
	
	int ans = 0;
	rep(i,a.size()){
		if(a[i]==0)continue;
		if(dp[i]!=1)ans++;
	}
	cout<<ans<<endl;
			
	
    return 0;
}