#include <bits/stdc++.h>  // clang-format off
using Int = long long;
#define REP_(i, a_, b_, a, b, ...) for (Int i = (a), lim##i = (b); i < lim##i; i++)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
struct SetupIO { SetupIO() { std::cin.tie(nullptr), std::ios::sync_with_stdio(false), std::cout << std::fixed << std::setprecision(13); } } setup_io;
#ifndef _MY_DEBUG
#define dump(...)
#endif  // clang-format on

/**
 *    author:  knshnb
 *    created: Fri Apr 24 22:20:28 JST 2020
 **/

template <class T> inline bool chmin(T& a, const T& b) {
    if (a <= b) return false;
    a = b;
    return true;
}
template <class T> inline bool chmax(T& a, const T& b) {
    if (a >= b) return false;
    a = b;
    return true;
}

template <class T, class S> T make_vec(S x) { return x; }
template <class T, class... Ts> auto make_vec(size_t n, Ts... ts) {
    return std::vector<decltype(make_vec<T>(ts...))>(n, make_vec<T>(ts...));
}

const Int INF = 1e18;
signed main() {
    Int n, V, L;
    std::cin >> n >> V >> L;
    std::vector<Int> x(n + 2), v(n + 2), w(n + 2);
    REP(i, 1, n + 1) std::cin >> x[i] >> v[i] >> w[i];
    x.back() = L;
    auto dp = make_vec<Int>(n + 2, V + 2, INF);
    REP(j, V + 1) dp[0][j] = 0;
    REP(i, 1, n + 2) {
        Int dif = x[i] - x[i - 1];
        dump(dif);
        for (Int j = V; j >= 0; j--) {
            if (j + dif <= V) chmin(dp[i][j], dp[i - 1][j + dif]);
        }
        for (Int j = V; j >= 0; j--) {
            if (j - v[i] >= 0) chmin(dp[i][j], dp[i][j - v[i]] + w[i]);
            chmin(dp[i][j], dp[i][j + 1]);
        }
    }
    std::cout << (dp[n + 1][0] == INF ? -1 : dp[n + 1][0]) << std::endl;
}