#include<bits/stdc++.h>
using namespace std;
template <class S, S (*op)(S, S), S (*e)()> class dynamic_segtree {
public:
    dynamic_segtree(size_t n) : n(n), root(nullptr) {}

    void set(size_t p, S x) {
        assert(p < n);
        set(root, 0, n, p, x);
    }

    S get(size_t p) const {
        assert(p < n);
        return get(root, 0, n, p);
    }

    S prod(size_t l, size_t r) const {
        assert(l <= r && r <= n);
        return prod(root, 0, n, l, r);
    }

    S all_prod() const { return root ? root->product : e(); }

    void reset(size_t l, size_t r) {
        assert(l <= r && r <= n);
        return reset(root, 0, n, l, r);
    }

    template <bool (*f)(S)> size_t max_right(size_t l) const {
        return max_right(l, [](S x) { return f(x); });
    }

    template <class F> size_t max_right(size_t l, const F& f) const {
        assert(l <= n);
        S product = e();
        assert(f(product));
        return max_right(root, 0, n, l, f, product);
    }

    template <bool (*f)(S)> size_t min_left(size_t r) const {
        return min_left(r, [](S x) { return f(x); });
    }

    template <class F> size_t min_left(size_t r, const F& f) const {
        assert(r <= n);
        S product = e();
        assert(f(product));
        return min_left(root, 0, n, r, f, product);
    }

private:
    struct node;
    using node_ptr = std::unique_ptr<node>;

    struct node {
        size_t index;
        S value, product;
        node_ptr left, right;

        node(size_t index, S value)
            : index(index),
              value(value),
              product(value),
              left(nullptr),
              right(nullptr) {}

        void update() {
            product = op(op(left ? left->product : e(), value),
                         right ? right->product : e());
        }
    };

    const size_t n;
    node_ptr root;

    void set(node_ptr& t, size_t a, size_t b, size_t p, S x) const {
        if (!t) {
            t = std::make_unique<node>(p, x);
            return;
        }
        if (t->index == p) {
            t->value = x;
            t->update();
            return;
        }
        size_t c = (a + b) >> 1;
        if (p < c) {
            if (t->index < p) std::swap(t->index, p), std::swap(t->value, x);
            set(t->left, a, c, p, x);
        } else {
            if (p < t->index) std::swap(p, t->index), std::swap(x, t->value);
            set(t->right, c, b, p, x);
        }
        t->update();
    }

    S get(const node_ptr& t, size_t a, size_t b, size_t p) const {
        if (!t) return e();
        if (t->index == p) return t->value;
        size_t c = (a + b) >> 1;
        if (p < c) return get(t->left, a, c, p);
        else return get(t->right, c, b, p);
    }

    S prod(const node_ptr& t, size_t a, size_t b, size_t l, size_t r) const {
        if (!t || b <= l || r <= a) return e();
        if (l <= a && b <= r) return t->product;
        size_t c = (a + b) >> 1;
        S result = prod(t->left, a, c, l, r);
        if (l <= t->index && t->index < r) result = op(result, t->value);
        return op(result, prod(t->right, c, b, l, r));
    }

    void reset(node_ptr& t, size_t a, size_t b, size_t l, size_t r) const {
        if (!t || b <= l || r <= a) return;
        if (l <= a && b <= r) {
            t.reset();
            return;
        }
        size_t c = (a + b) >> 1;
        reset(t->left, a, c, l, r);
        reset(t->right, c, b, l, r);
        t->update();
    }
};
using S = long long;
S op(S a, S b){
	return max(a, b);
}
S e(){
	return 0;
};
int main(){
	long long n, s, h;
	cin >> n >> s >> h;
	vector<int> x(n), y(n), z(n);
	for(int i = 0; i < n; i++){
		cin >> x[i] >> y[i] >> z[i];
	}
	vector<long long> ch;
	for(int i = 0; i < n; i++){
		ch.push_back(x[i]);
		ch.push_back(y[i]);
		ch.push_back(x[i]-s);
		ch.push_back(y[i]-s);
		ch.push_back(x[i]-h);
		ch.push_back(y[i]-h);
		ch.push_back(x[i]+s+h);
		ch.push_back(y[i]+s+h);
		ch.push_back(x[i]+s-h);
		ch.push_back(y[i]+s-h);
		ch.push_back(x[i]-s+h);
		ch.push_back(y[i]-s+h);
		ch.push_back(x[i]-s-h);
		ch.push_back(y[i]-s-h);
	}
	sort(ch.begin(), ch.end());
	dynamic_segtree<S, op, e> d(1LL<<31);
	int pz = 3;
	if(n < 150000) pz = 4;
	if(n < 100000) pz = 5;
	if(n < 50000) pz = 8;
	vector<pair<int, int>> p(pz);
	vector<long long> sum(pz);
	for(auto a:ch){
		if(a < 0) continue;
		if(a >= (1LL<<31)) continue;
		long long cnt = 0;
		for(int i = 0; i < pz; i++){
			while(a-(s+h)*(i+1) > x[p[i].first] && p[i].first < n){
				sum[i] -= z[p[i].first];
				p[i].first++;
			}
			while(a-(s+h)*(i+1)+s >= y[p[i].second] && p[i].second < n){
				sum[i] += z[p[i].second];
				p[i].second++;
			}
			cnt += sum[i];
			long long u = d.prod(0, max(0LL, a-(s+h)*(i+1))) + cnt;
			d.set(a, max(d.get(a), u));
		}
	}
	cout << d.prod(0, 1LL<<31) << endl;
}