#include <bits/stdc++.h>
using namespace std;

#define fs first
#define sc second
#define pb emplace_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()

const int32_t inf = 1001001001;
const int64_t infll = 1001001001001001001ll;
const int dx[] = {0, -1, 1, 0, -1, 1, -1, 1}, dy[] = {-1, 0, 0, 1, -1, -1, 1, 1};

template <typename T> using vector2d = vector<vector<T>>;

// clang-format off
template <typename T> void sort(vector<T> &v) { sort(all(v)); }
// ostream &operator<<(ostream &os, __int128_t value) { if (ostream::sentry(os)) { __uint128_t tmp = value < 0 ? -value : value; char buffer[64]; char *d = end(buffer); do { --d; *d = "0123456789"[tmp % 10]; tmp /= 10; } while (tmp != 0); if (value < 0) { --d; *d = '-'; } int len = end(buffer) - d; if (os.rdbuf()->sputn(d, len) != len) { os.setstate(ios_base::badbit); }} return os; }
// istream &operator>>(istream &is, __int128_t &value) { string in; is >> in; value = 0; for (const char &c : in) { if ('0' <= c && c <= '9') value = 10 * value + (c - '0'); } if (in[0] == '-') value *= -1; return is; }
// ostream &operator<<(ostream &os, __uint128_t value) { if (ostream::sentry(os)) { char buffer[64]; char *d = end(buffer); do { --d; *d = "0123456789"[value % 10]; value /= 10; } while (value != 0); int len = end(buffer) - d; if (os.rdbuf()->sputn(d, len) != len) { os.setstate(ios_base::badbit); }} return os; }
// istream &operator>>(istream &is, __uint128_t &value) { string in; is >> in; value = 0; for (const char &c : in) { if ('0' <= c && c <= '9') value = 10 * value + (c - '0'); } return is; }
template <typename T> ostream &operator<<(ostream &os, vector<T> &v) { os << v[0]; for (int i = 1; i < v.size(); ++i) os << " " << v[i]; return os; }
template <typename T> istream &operator>>(istream &is, vector<T> &v) { for (T &in : v) is >> in; return is; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, pair<T1, T2> p) { os << p.fs << " " << p.sc; return os; }
template <typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p) { is >> p.fs >> p.sc; return is; }

struct IoSetup { IoSetup(){ cin.tie(0); ios::sync_with_stdio(0); cout << fixed << setprecision(10); cerr << fixed << setprecision(10); } } iosetup;

inline int64_t in() { int64_t x = 0; cin >> x; return x; }
template <typename T1, typename T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
template <typename T1, typename T2> inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }
// clang-format on

signed main(int argc, char *argv[]) {
  int n = in();
  vector<vector<int>> s(3), e(3), zip(3);

  // vector<int> a, b, c;zip[1]
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < 3; ++j) {
      int sh = in(), sm = in(), eh = in(), em = in();
      int S = 60 * sh + sm;
      int E = 60 * eh + em;

      s[j].pb(S);
      e[j].pb(E);
      zip[j].pb(S);
      zip[j].pb(E);
    }
  }

  sort(zip[0]);
  zip[0].erase(unique(all(zip[0])), zip[0].end());
  sort(zip[1]);
  zip[1].erase(unique(all(zip[1])), zip[1].end());
  sort(zip[2]);
  zip[2].erase(unique(all(zip[2])), zip[2].end());

  int ans = 0;
  for (auto &t1 : zip[0]) {
    for (auto &t2 : zip[1]) {
      for (auto &t3 : zip[2]) {
        int cnt = 0;
        for (int i = 0; i < n; ++i) {
          if (s[0][i] <= t1 && t1 <= e[0][i] && s[1][i] <= t2 && t2 <= e[1][i] && s[2][i] <= t3 && t3 <= e[2][i]) cnt++;
        }

        chmax(ans, cnt);
      }
    }
  }

  cout << ans << endl;
}



Measured memory_bytes: 3240