#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <cmath>
#include <sstream>
#include <queue>
 
using namespace std;
typedef long long ll; typedef vector<int> VI;
typedef pair<int,int> pii;
 
#define rep2(x,fr,to) for(int (x)=(fr);(x)<(to);(x)++)
#define rep(x,to) for(int (x)=0;(x)<(to);(x)++)
#define repr(x,fr,to) for(int (x)=(fr);(x)>=(to);(x)--)
#define all(c) (c).begin(),(c).end()
#define sz(v) (int)(v).size()
 
#define debug(X) cout<<"["<<#X<<"]"<<X<<endl;
#define debug2(X) cout<<X<<endl;

#define MAX_N 800
#define MAX_M 3

const int INF=1e8;
typedef pair<int,int>P;

//int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
//	queue<P> que;

#include <deque>
int i,j,N,M;
int E[MAX_N];
int ER[MAX_N];
int kumi[MAX_N][MAX_N];
int kitai=0;
bool f=false;
bool solve(){
		f =false;
		int sum=0;
		rep (k,N)rep(l,N)kumi[k][l]=0;
		int k=0;
		repr(k,N-1,2){
			rep2(l,0,k){
				rep2(m,l+1,k){
				//debug (k);
				//debug (l);
			//debug (m);
				
				if ((ER[l]<ER[m]&&ER[m]<ER[k])||(ER[k]<ER[m]&&ER[m]<ER[l])){}
				else {
				//debug (k);
				if (kumi[k][l]==0){sum+=k+1;kumi[k][l]=1;}
				if (kumi[k][m]==0){sum+=k+1;kumi[k][m]=1;}
				if (kumi[m][l]==0){sum+=k+1;kumi[m][l]=1;}
			
				}
					//debug (sum);
				}
			
			} //kの位置
				//debug (sum);
		}

		
		//debug(sum);
		if (kitai<sum){kitai =sum;return true;}
		else return false;
}

int main(){
	int res2=0;
	cin>>N>>M;
	rep(j,M){rep(i,N){
	cin>>E[i];
	ER[E[i]-1]=i;
	}
	if (solve()) res2=j;
	}
	
	
	cout <<res2<<endl;
	
}