#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INT_MAX (1ll<<60)
struct SSP{
	int n, source, sink;
    vector<vector<int> > adj;
	struct edge {
        int u, flow, cap, cost, origcost;
    };
	vector<edge> edges;
	SSP(int n, int source, int sink): n(n),source(source),sink(sink),adj(n) {}
    int add_edge(int a, int b, int cap, int cost){
        int result = edges.size();
        adj[a].push_back(edges.size());
        edges.push_back({b, 0, cap, cost, cost});
        adj[b].push_back(edges.size());
        edges.push_back({a, 0, 0, -cost, -cost});
        return result;
    }
    pair<int, int> djk(){
        struct state_t{
            int dist, prev, maxf;
        };
        queue<int> q;
        vector<state_t> states(n, {INT_MAX/2, -1, 0});
        states[source] = {0, -2, INT_MAX};
        vector<int> inqueue(n, 0);
        inqueue[source] = 1;
        q.push(source);
        while(!q.empty()){
            int v = q.front(); q.pop();
            inqueue[v] = 0;
            for(int edid : adj[v]){
                edge & ed = edges[edid];
                if(ed.flow < ed.cap && states[ed.u].dist > states[v].dist + ed.cost){
                    states[ed.u].dist = states[v].dist + ed.cost;
                    states[ed.u].prev = edid;
                    states[ed.u].maxf = min(states[v].maxf, ed.cap - ed.flow);
                    if(!inqueue[ed.u]) q.push(ed.u), inqueue[ed.u] = 1;
                }
            }
        }
        int lastid = states[sink].prev, extraflow = states[sink].maxf, atcost = 0;
        if(lastid == -1) return {0, 0};
        for(int id = lastid; id != -2; id = states[edges[id^1].u].prev){
            edges[id].flow += extraflow;
            edges[id^1].flow -= extraflow;
            atcost += edges[id].origcost;
        }
        for(int id = 0; id < (int) edges.size(); id++){
            int v = edges[id^1].u, u = edges[id].u;
            if(states[v].prev != -1 && states[u].prev != -1)
                edges[id].cost += states[v].dist - states[u].dist;
        }
        return {extraflow, atcost};
    }
    pair<int, int> mfmc(){
        int flow = 0, cost = 0;
        if(any_of(edges.begin(), edges.end(), [](const edge & ed){
            return ed.flow > 0 && ed.cost < 0;
        })) bellamanford();
        int extraflow, atcost;
        while(tie(extraflow, atcost) = djk(), extraflow > 0)
            flow += extraflow, cost += extraflow * atcost;
        return {flow, cost};
    }
    void bellamanford(){
        vector<int> dist(n, INT_MAX/2);
        dist[source] = 0;
        for(int rep = 0; rep < n; rep++){
            bool changed = false;
            for(int id = 0; id < (int)edges.size(); id++){
                int v = edges[id^1].u, u = edges[id].u;
                if(edges[id].flow < edges[id].cap && dist[v] != INT_MAX/2 &&
                    dist[u] > dist[v] + edges[id].cost){
                    dist[u] = dist[v] + edges[id].cost;
                    changed = true;
                    assert(rep < n - 1);
                }
            }
            if(!changed) break;
        }
        for(int id = 0; id < (int) edges.size(); id++){
            int v = edges[id^1].u, u = edges[id].u;
            if(dist[v] < INT_MAX/2 && dist[u] < INT_MAX/2)
                edges[id].cost += dist[v] - dist[u];
        }
    }
};
#undef int
int main(){
	int n; cin >> n;
	vector<int> nd(2 * n);
	int cnt = 0;
	int S = cnt++, T = cnt++;
	for(int i = 0; i < 2 * n; i++) nd[i] = cnt++;
	vector<int> p(4);
	for(int i = 0; i < 4; i++) p[i] = cnt++;
	SSP flow(cnt, S, T);
	for(int i = 0; i < n; i++){
		int x, y, c; cin >> x >> y >> c;
		flow.add_edge(S, nd[i], c, 0);
		flow.add_edge(nd[i], p[0], c, x + y);
		flow.add_edge(nd[i], p[1], c, x - y);
		flow.add_edge(nd[i], p[2], c, - x + y);
		flow.add_edge(nd[i], p[3], c, - x - y);
	}
	for(int i = 0; i < n; i++){
		int x, y, c; cin >> x >> y >> c;
		flow.add_edge(nd[i + n], T, c, 0);
		flow.add_edge(p[0], nd[i + n], c, - x - y);
		flow.add_edge(p[1], nd[i + n], c, - x + y);
		flow.add_edge(p[2], nd[i + n], c, x - y);
		flow.add_edge(p[3], nd[i + n], c, x + y);
	}
	long long ans = flow.mfmc().second;
	cout << -ans << endl;
	return 0;
}


Measured memory_bytes: 1812