#include <bits/stdc++.h>
#define N_MAX 3505

using namespace std;

ifstream fin("cutii.in");

ofstream fout("cutii.out");

struct cutie
{
    int x, y, z;
} v[N_MAX];
int dp[N_MAX], n, t;
bool comp(cutie a, cutie b)
{
    return a.z < b.z;
}
int main()
{
    fin >> n >> t;
    while (t--)
    {int rez=0;
        for (int i = 1; i <= n; i++)
        {
            fin >> v[i].x >> v[i].y >> v[i].z;
            dp[i] = 1;
        }
        sort(v + 1, v + n + 1, comp);
        for (int i = 1; i < n; i++)
            for (int j = i + 1; j <= n; j++)
            {
                if (v[i].x < v[j].x && v[i].y < v[j].y)
                {
                    dp[j] = max(dp[j], dp[i] + 1);
                    rez=max(rez,dp[j]);
                }
            }
    fout<<rez<<'\n';
    }
}