#include <bits/stdc++.h>
#include <atcoder/convolution>
using namespace std;
int main(){
  int N, M;
  cin >> N >> M;
  vector<int> A(N), B(N), C(N);
  for (int i = 0; i < N; i++){
    cin >> A[i] >> B[i] >> C[i];
  }
  vector<int> X(M), Y(M), Z(M);
  for (int i = 0; i < M; i++){
    cin >> X[i] >> Y[i] >> Z[i];
  }
  vector<int> a(N);
  for (int i = 0; i < N; i++){
    a[i] = A[i] * 10201 + B[i] * 101 + C[i];
  }
  vector<int> b(M);
  for (int i = 0; i < M; i++){
    b[i] = X[i] * 10201 + Y[i] * 101 + Z[i];
  }
  vector<long long> f(1030301, 0);
  for (int i = 0; i < N; i++){
    f[a[i]]++;
  }
  vector<long long> g = f;
  reverse(g.begin(), g.end());
  vector<long long> h = atcoder::convolution(f, g);
  int ans = 0;
  for (int i = 0; i < M; i++){
    ans = max(ans, N * 2 - (int) h[1030300 + b[i]]);
  }
  cout << ans << endl;
}