#include <fstream>
#include <iostream>
using namespace std;
ifstream cin("cartonase.in");
ofstream cout("cartonase.out");
int n , x , y , cer , st , dr  , cnt , p , lmax , cate;
int main()
{
    cin >> cer >> n;
    for(int i = 1 ; i <= n ; i++)
    {
        cin >> x >> y;
        if(x == dr)
        {
            cate++;
            cnt++;
        }
        else
        {
            if(cnt > lmax) lmax = cnt , p = 0;
            else if(cnt == lmax) p++;
            cnt = 0;
        }
        st = x , dr = y;
    }
    if(cnt > 0)
    {
        if(cnt > lmax) lmax = cnt;
        else if(cnt == lmax) p++;
    }
    if(cer == 1)cout << cate;
    else if(cer == 2) cout << lmax + 1;
    else cout << p + 1;
    return 0;
}