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#include <algorithm>
#include <array>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <exception>
#include <fstream>
#include <functional>
#include <iostream>
#include <map>
#include <numeric>
#include <regex>
#include <set>
#include <sstream>
#include <stdexcept>
#include <string>
#include <tuple>
#include <typeinfo>
#include <vector>

#include <unordered_set>
#include <unordered_map>
#include <bitset>

using namespace std;
#define rep(i,b) for(auto i=(0);i<(b);++i)
#define fo(i,a,b) for(auto i=(a);i<=(b);++i)
#define ford(i,a,b) for(auto i=(a);i>=(b);--i)
#define fore(a,b) for(auto &a:(b))
#define v vector
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define clr(x,a) memset(x,a,sizeof(x))

template <typename T, size_t N> struct ma : array<T,N> { T& operator[](size_t n) {
#ifdef DEBUG
           assert(n < N);
#endif
return (*static_cast<array<T,N>*>(this))[n]; } } ; typedef long long ll; typedef long double ld; typedef vector<int> vi; typedef vector<string> vs; typedef ostringstream oss; typedef istringstream iss;
template<class T> string to_str(const T &a) { oss os; os << a; return os.str(); }
template<> string to_str<ld>(const ld& a) { oss os; os.precision(10); os.setf(ios::fixed); os << a; return os.str(); }
template<class T> T from_str(const string &s) { iss is; T val; is >> val; return val; }

int cond = (ll)1;
#define db(x...) { if (cond > 0) { cond--; rep (xxx, 1) cerr << __LINE__ << " " << #x << " " << x << endl; cerr.flush(); } }
#define dbv(x...) { if (cond > 0) { cerr << __LINE__<<": "; fore (it, x) cerr << it <<" "; cerr << endl; } }
//template <class C, class=typename C::iterator> struct _cprint { using type = void;}; template<> struct _cprint<string> {};
//template <class C, class=typename _cprint<C>::type> ostream& operator<<(ostream &o, const C& v){ for(auto x:v) o<<x<<" "; return o; }
//

typedef array<ll, 3> d3;

map<ll, ll> mapa;


void solve() {
    ll n, m, w, h;
    scanf("%lld%lld", &n, &m);
    scanf("%lld%lld", &w, &h);
    v<d3> dat;
    rep (i, n) {
        ll x, y, c;
        scanf("%lld%lld%lld", &x, &y, &c);
        y =  - y;
        dat.pb({{ x*h + y*w, y*w - x*h, -c}});//, x, y}});
        db(dat[i][0]<<" "<<dat[i][1]<<" "<<x<<" "<<y<< " "<<c);
    }
    rep (i, m) {
        ll x, y, c;
        scanf("%lld%lld%lld", &x, &y, &c);
        y =  - y;
        dat.pb({{ x*h + y*w, y*w - x*h, c}});//, x, y}});
        db(dat[i][0]<<" "<<dat[i][1]<<" "<<x<<" "<<y<< " "<<c);
    }
    sort(all(dat));
    ll ret = 0;
    rep (i, n + m) {
        ll &eq1 = dat[i][0];
        ll &eq2 = dat[i][1];
        eq2 = -eq2;
        ll &c = dat[i][2];
        //ll &x = dat[i][3];
        //ll &y = dat[i][4];
        if (c >= 1) {
            mapa[eq2] += c;
        }
        else {
            c = -c;
            ll old_c = c;
            auto it = mapa.lower_bound(eq2);
            while (c > 0) {
                if (it == mapa.end()) break;
                int ile = min(c, it->second);
                c -= ile;
                it->second -= ile;
                auto old_it = it;
                it++;
                if (old_it->second == 0) {
                    mapa.erase(old_it);
                }
                else break;
            }
            ret += c;
 //           db(x<<" "<<y<<" "<<old_c);
//            db(c);
        }
    }
    cout << ret << endl;

}

int main(int argc, char ** argv) {
    ios::sync_with_stdio(false);
    //  freopen("../1.in","r",stdin); 
    //  freopen("../2.in","r",stdin); 
    //  freopen("../3.in","r",stdin); 
    //  freopen("../A-small.in","r",stdin); freopen("../A-small.out","w",stdout);
    //  freopen("../A-small-attempt0.in","r",stdin);freopen("../A-small-attempt0.out","w",stdout);
    //  freopen("../A-small-attempt1.in","r",stdin);freopen("../A-small-attempt1.out","w",stdout);
    //  freopen("../A-small-attempt2.in","r",stdin);freopen("../A-small-attempt2.out","w",stdout);
    //  freopen("../A-large.in","r",stdin); freopen("../A-large.out","w",stdout)

    vs args;
    int nr_test = -1;
    int t = 1;

    fo (i, 1, argc - 1) args.pb(argv[i]);
    fore (it, args) if (it == "q") cond = 1000;
    fore (it, args) if (it == "all") t = 1000;
    fore (it, args) if (atoi(it.c_str()) > 0) nr_test = atoi(it.c_str());

    fo (i, 1, argc - 1) {
        if (string(argv[i]) == "q")
            cond = 1000;
        if (string(argv[i]) == "all")
            t = 1000;
    }
    fo (i, 1, t) {
        solve();
    }
	return 0;
}