#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using mint = atcoder::modint998244353;

const int tot = 101*101*101;

int colid(int a, int b, int c){
    return a + b*101 + c*101*101;
}

int main(){
    int n, m; cin >> n >> m;
    vector<mint> f(tot,0);
    for (int i = 0; i < n; i++){
        int a, b, c; cin >> a >> b >> c;
        f[colid(a,b,c)] = 1;
    }
    auto g = f;
    reverse(g.begin(),g.end());
    auto fg = atcoder::convolution(f,g);
    int ans = 0;
    for (int i = 0; i < m; i++){
        int x, y, z; cin >> x >> y >> z;
        int d = colid(x,y,z);
        int sum = fg[tot-1+d].val();
        ans = max(ans,n+n-sum);
    }
    cout << ans << endl;
}