#include <cstdio>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;

int N, T;

template<int D, int Sz, int... SzArgs>
struct FenwickTree {
  FenwickTree<D - 1, SzArgs...> tree[Sz];

  template<typename T = int, typename... Args>
  void update(int val, int x, Args... args) {
    for(int i = x; i < Sz; i += (i & -i)) {
      tree[i].update(val, args...);
    }
  }

  template<typename T = int, typename... Args>
  int query(int x, Args... args) {
    int ret = 0;
    for(int i = x; i > 0; i -= (i & -i))
      ret = max(ret, tree[i].query(args...));
    return ret;
  }
};

template<int Sz>
struct FenwickTree<1, Sz> {
  int tree[Sz] = {0};

  template<typename T = int>
  void update(int val, int x) {
    for(int i = x; i < Sz; i += (i & -i)) {
      tree[i] = max(tree[i], val);
    }
  }

  template<typename T = int>
  int query(int x) {
    int ret = 0;
    for (int i = x; i > 0; i -= (i & -i))
      ret = max(ret, tree[i]);
    return ret;
  }
};

struct cutie {
  int x, y, z;
  cutie(int x, int y, int z) : x(x), y(y), z(z) { }
};

#define cmp(c)                                            \
  [] (const cutie& a, const cutie& b) -> bool {           \
    return a.c < b.c;                                     \
  }

void solve_test() {
  vector<cutie> cutii;

  // read
  for(int i = 0; i < N; ++i) {
    int x, y, z;
    scanf("%d%d%d", &x, &y, &z);
    cutii.push_back(cutie(x, y, z));
  }

  // sort
  sort(cutii.begin(), cutii.end(), cmp(x));

  FenwickTree<2, 4000, 4000> fen;
  int best = 0;

  for(const auto& c : cutii) {
    int q = 1 + fen.query(c.y - 1, c.z - 1);
    best = max(best, q);
    // fen.update(q, c.y, c.z);
  }

  printf("%d\n", best);
}

int main(int argc, char *argv[]) {
  freopen("cutii.in", "r", stdin);
  freopen("cutii.out", "w", stdout);

  scanf("%d%d", &N, &T);
  while(T--) solve_test();

  return 0;
}