#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)

int timer(){
	static auto st = chrono::system_clock::now();
	auto en = chrono::system_clock::now();
	return chrono::duration_cast<chrono::milliseconds>(en - st).count();
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	timer();
	int n,m;
	cin>>n>>m;
	vector<int> a(n),b(n),c(n);
	vector<int> x(m),y(m),z(m);
	rep(i,n) cin>>a[i]>>b[i]>>c[i];
	rep(i,m) cin>>x[i]>>y[i]>>z[i];
	bitset<1030301> stl;
	rep(i,n){
		stl[a[i]+101*b[i]+101*101*c[i]]=1;
	}
	vector<pair<int,int>> vp(m);
	rep(i,m){
		vp[i].first=x[i]*x[i]+y[i]*y[i]+z[i]*z[i];
		vp[i].second=abs(x[i]+101*y[i]+101*101*z[i]);
	}
	sort(vp.begin(),vp.end());
	int ans=n;
	rep(i,m){
		ans=max(ans,n*2-(int)(stl&(stl>>vp[m-1-i].second)).count());
		if(i%10==0&&timer()>1950) break;
	}
	cout<<ans<<"\n";
}