#include<bits/stdc++.h>
using namespace std;
 
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define db double
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
	int n,k;cin>>n>>k;
	int b=1; rep(i,k)b*=5;
	vc<int>f(k+1,1); rep(i,k)f[i+1]=f[i]*5;
	vc<int>xs(n);
	rep(i,n){
		int x=0;
		sr ss;cin>>ss;
		rep(j,k){
			int a=ss[j]-'0';
			x+=f[j]*a;
		}
		xs[i]=x;
	}
	vc<int>s(f[k]-1,0);
	rep(i,n)s[xs[i]]++;
	rep(i,k)for(int j=f[k]-1;j>=0;j--){
		if((j/f[i])%5!=4)s[j]+=s[j+f[i]];
	}
	int ans=0;
	rep(i,n)if(s[xs[i]]>1)ans++;
	cout<<ans;
}