import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int volume = sc.nextInt();
        int length = sc.nextInt();
        TreeMap<Integer, Long> base = new TreeMap<>();
        base.put(volume, 0L);
        int prev = 0;
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            int v = sc.nextInt();
            long w = sc.nextInt();
            TreeMap<Integer, Long> next = new TreeMap<>();
            for (int y : base.keySet()) {
                long value = base.get(y);
                int none = y - x + prev;
                if (none >= 0) {
                    Integer key = next.ceilingKey(none);
                    if (key == null || next.get(key) > value) {
                        next.put(none, value);
                        key = none;
                        while ((key = next.lowerKey(key)) != null) {
                            if (next.get(key) >= value) {
                                next.remove(key);
                            } else {
                                break;
                            }
                        }
                    }
                    int full = Math.min(volume, none + v);
                    key = next.ceilingKey(full);
                    if (key == null || next.get(key) > value + w) {
                        next.put(full, value + w);
                        key = full;
                        while ((key = next.lowerKey(key)) != null) {
                            if (next.get(key) >= value + w) {
                                next.remove(key);
                            } else {
                                break;
                            }
                        }
                    }
                }
            }
            prev = x;
            base = next;
        }
        for (int y : base.keySet()) {
            if (y - length + prev >= 0) {
                System.out.println(base.get(y));
                return;
            }
        }
        System.out.println(-1);
    }
}