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#include<algorithm>
#include<bitset>
#include<cassert>
#include<complex>
#include<cstring>
#include<cstdio>
#include<iomanip>
#include<map>
#include<iostream>
#include<queue>
#include<set>
#include<stack>
#include<string>
#include<vector>

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORD(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i,n) for(int i=0; i<(n); ++i)
#define VAR(v,i) __typeof(i) v = (i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) ((int)(x).size())
#define PB push_back
#define MP make_pair
#define X first
#define Y second
#define debug(x) { cerr << #x <<" = " << (x) << endl; }
#define debugv(x) { cerr << #x << " = "; FORE(it, x) cerr << *it << ", "; cerr << endl;  }
#define dprintf(...) fprintf(stderr, __VA_ARGS__)

using namespace std;

typedef pair<int, int> PII;;
typedef vector<int> VI;
typedef long long LL;
typedef long double LD;
template<class C> void mini(C&a4, C b4) { a4 = min(a4,b4); }
template<class C> void maxi(C&a4, C b4) { a4 = max(a4,b4); }
template<class T1, class T2> ostream& operator<<(ostream &out, pair<T1, T2> pair) { return out << "(" << pair.X << ", "<< pair.Y << ")"; };

const int N = 2e5 + 3;
const LL INF = 2e18;
int n, m;
int w, h;

struct El {
    int x, y, i, v, t;
};

El e[N*2];

LL toE1(int x, int y) {
    return LL(x) * h + LL(y) * w;
}

LL toE2(int x, int y) {
    return LL(x) * (-h) + LL(y) * w;
}

bool cmp1(int a, int b) {
    LL A = toE1(e[a].x, e[a].y);
    LL B = toE1(e[b].x, e[b].y);
    if (A != B) return A < B;
    return e[a].t < e[b].t;
}

bool cmp2(int a, int b) {
    LL A = toE2(e[a].x, e[a].y);
    LL B = toE2(e[b].x, e[b].y);
    if (A != B) return A < B;
    return e[a].t < e[b].t;
}

const int S = N*4;
int size;

struct V {
    LL inc;
    LL max;
};
V t[S*2];

void insertMax(int p, LL v) {
    p += size;
    int q = p;
    while (q) {
        v -= t[q].inc;
        q /= 2;
    }
    t[p].max = v;
    p /= 2;
    while (p) {
        t[p].max = max(t[p*2].max + t[p*2].inc, 
                t[p*2+1].max + t[p*2+1].inc);
        p /= 2;
    }
}

void insertSum(int p, int a, int b, int A, int B, LL v) {
    if ((b <= A) || (B <= a)) return;
    if ((a <= A) && (B <= b)) {
        t[p].inc += v;
        return;
    }
    insertSum(p*2, a, b, A, (A+B)/2, v);
    insertSum(p*2+1, a, b, (A+B)/2, B, v);
    t[p].max = max(t[p*2].max + t[p*2].inc, 
            t[p*2+1].max + t[p*2+1].inc);
}

LL queryMax(int p, int a, int b, int A, int B) {
    if ((b <= A) || (B <= a)) return -INF;
    if ((a <= A) && (B <= b)) {
        return t[p].max + t[p].inc;
    }
    return max(queryMax(p*2, a, b, A, (A+B)/2),
            queryMax(p*2+1, a, b, (A+B)/2, B)) + t[p].inc;
}

LL queryMax(int p) {
    return queryMax(1, p, size, 0, size);
}

void insertSum(int p, LL v) {
    insertSum(1, 0, p+1, 0, size, v);
}

int main() {
    ios_base::sync_with_stdio();
    cout << fixed << setprecision(10);
   
    scanf("%d %d", &n, &m);
    scanf("%d %d", &w, &h);
   
    int c = 0; 
    REP(i, n) {
        scanf("%d %d %d", &e[c].x, &e[c].y, &e[c].v);
        e[c].t = 0;
        ++c;
    }
    REP(i, m) {
        scanf("%d %d %d", &e[c].x, &e[c].y, &e[c].v);
        e[c].t = 1;
        ++c;
    }
    VI ind;
    REP(i, c) ind.PB(i);
    sort(ALL(ind), cmp1);
    REP(i, SZ(ind)) e[ind[i]].i = i+1;
    sort(ALL(ind), cmp2);
    
    size = 1;
    while (size < c) size *= 2;
    REP(i, size*2) {
        t[i].inc = 0;
        t[i].max = -INF;
    }

    for (int i: ind) {
        if (e[i].t == 0) {
            LL curr = max(0ll, queryMax(e[i].i));
            insertMax(e[i].i, curr);
            insertSum(e[i].i, e[i].v);
        } else {
            insertSum(e[i].i, -e[i].v);
        }
    }

    printf("%lld\n", queryMax(0));

    return 0;
}