#include<iostream>
#include<algorithm>
#include<vector>
#include<cassert>
#include<atcoder/modint>
#include<atcoder/convolution>
using namespace std;
using mint=atcoder::modint998244353;
const int W=101;
const int L=W*W*W;
int N,M;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin>>N>>M;
	vector<mint>A(L);
	for(int i=0;i<N;i++)
	{
		int a,b,c;cin>>a>>b>>c;
		A[a*W*W+b*W+c]=1;
	}
	vector<mint>B=A;
	reverse(B.begin(),B.end());
	A=atcoder::convolution(A,B);
	int ans=N;
	for(int i=0;i<M;i++)
	{
		int x,y,z;cin>>x>>y>>z;
		x=x*W*W+y*W+z;
		ans=max(ans,2*N-(int)A[x+L-1].val());
	}
	cout<<ans<<endl;
}