/*
                    __
                   /\ \
 _ __   ___     ___\ \ \/'\     ___      __      ___     ___      __
/\`'__\/ __`\  /'___\ \ , <    / __`\  /'__`\  /' _ `\ /' _ `\  /'__`\
\ \ \//\ \L\ \/\ \__/\ \ \\`\ /\ \L\ \/\ \L\.\_/\ \/\ \/\ \/\ \/\ \L\.\_
 \ \_\\ \____/\ \____\\ \_\ \_\ \____/\ \__/.\_\ \_\ \_\ \_\ \_\ \__/.\_\
  \/_/ \/___/  \/____/ \/_/\/_/\/___/  \/__/\/_/\/_/\/_/\/_/\/_/\/__/\/_/


*/

#ifndef __AHA__HEADER
#define __AHA__HEADER

#include <bits/stdc++.h>
using namespace std;
#define g0 get<0>
#define g1 get<1>
#define g2 get<2>
#define ft first
#define sd second
#define sz(x) (i6) x.size()
#define psb(x) push_back(x)
#define ppb() pop_back()
#define bg(x) x.begin()
#define ed(x) x.end()
#define col(x) x.begin(), x.end()
#define srt(x) sort(x.begin(), x.end())

#define pq priority_queue
#define fn function
#ifdef LOCAL
#define git stauDBG_MACRO_NO_WARNING
#include <dbg.h>
#else
#define dbg(...)
#endif
#define endl '\n'

template <typename T>
using vec = vector<T>;
template <typename T>
using deq = deque<T>;
template <typename K, typename V>
using hmap = unordered_map<K, V>;

using str = string;
using vb = vec<bool>;

using byte = int8_t;
using i3 = int32_t;
using i6 = int64_t;
using i64 = int;
using u3 = uint32_t;
using u6 = uint64_t;

using d6 = long double;

using p3 = pair<i3, i3>;
using vi3 = vec<i3>;
using vp3 = vec<p3>;

using p6 = pair<i6, i6>;
using vi6 = vec<i6>;
using vd6 = vec<d6>;
using vp6 = vec<p6>;
using vv = vec<vi6>;

using dp6 = deq<p6>;
using di6 = deq<i6>;

using mi6 = map<i6, i6>;
using mp6 = map<p6, i6>;
using si6 = set<i6>;
using hi6 = hmap<i6, i6>;

using bs = bitset<64>;

using graph = vv;
using matrix = vv;

const d6 EPS = 1 / 1000000.0;
const i6 ZERO = 0;
const i6 _0 = ZERO;
const i6 ONE = 1;
const i6 _1 = ONE;
const i6 INF = INT64_MAX / 4;
const i6 NINF = -INF;

namespace std {
template <typename T1, typename T2>
struct hash<pair<T1, T2>> {
  std::size_t operator()(const pair<T1, T2>& pair) const noexcept {
    return hash<T1>()(pair.first) ^ hash<T2>()(pair.second);
  }
};
}  // namespace std

template <typename T1, typename T2>
istream& operator>>(istream& stream, pair<T1, T2>& p) {
  stream >> p.ft;
  stream >> p.sd;
  return stream;
}

template <typename T1, typename T2>
ostream& operator<<(ostream& stream, const pair<T1, T2>& p) {
  return stream << p.ft << " " << p.sd;
}

template <typename T>
istream& operator>>(istream& stream, vec<T>& v) {
  if (v.empty()) {
    u6 len;
    stream >> len;
    v.assign(len, T());
  }
  for (auto i = 0; i < sz(v); i++) {
    stream >> v[i];
  }
  return stream;
}

template <typename T>
ostream& operator<<(ostream& stream, const vec<T>& v) {
  if (!v.empty()) {
    stream << v[0];
  }
  for (auto i = 1; i < sz(v); i++) {
    stream << " " << v[i];
  }
  return stream;
}

template <typename T>
istream& operator>>(istream& stream, deq<T>& v) {
  if (v.empty()) {
    u6 len;
    stream >> len;
    v.assign(len, T());
  }
  for (auto i = 0; i < sz(v); i++) {
    stream >> v[i];
  }
  return stream;
}

template <typename T>
ostream& operator<<(ostream& stream, const deq<T>& v) {
  if (!v.empty()) {
    stream << v[0];
  }
  for (auto i = 1; i < sz(v); i++) {
    stream << " " << v[i];
  }
  return stream;
}
#endif

class fentree {
 private:
  int f[3501][3501];
  i64 l = 3500;
  i64 col = 3500;

  inline i64 lsbl(i64 x) { return (x & (-x)); }

 public:
  void update(i64 i, i64 j, i64 val) {
    i64 b = j;
    while (i <= l) {
      j = b;
      while (j <= col) {
        f[i][j] = max(f[i][j], val);
        j += lsbl(j);
      }
      i += lsbl(i);
    }
  }

  i64 query(i64 i, i64 j) {
    i64 b = j;
    i64 res = 0;
    while (i > 0) {
      j = b;
      while (j > 0) {
        res = max(res, f[i][j]);
        j -= lsbl(j);
      }
      i -= lsbl(i);
    }

    return res;
  }

  void reset() {
    for (i64 i = 0; i <= l; i++) {
      for (i64 j = 0; j <= col; j++) {
        f[i][j] = 0;
      }
    }
  }
};

fentree f;

struct box {
  int x, y, z;

  bool operator<(const box b) const { return x < b.x; }
};

int main() {
  // ios::sync_with_stdio(0);
  // #ifdef LOCAL
  ifstream cin{"cutii.in"};
  ofstream cout{"cutii.out"};
  //#endif

  i64 n, t;
  cin >> n >> t;

  vector<box> v(n);
  for (i64 tt = 0; tt < t; tt++) {
    for (i64 i = 0; i < n; i++) {
      i64 x, y, z;
      cin >> x >> y >> z;
      v[i] = {x, y, z};
    }
    srt(v);

    i64 res = 0;
    for (i64 i = 0; i < n; i++) {
      i64 crt = 1 + f.query(v[i].y, v[i].z);
      res = max(res, crt);

      f.update(v[i].y, v[i].z, crt);
    }

    cout << res << endl;

    f.reset();
  }

  return 0;
}