#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max()/32*15+208;

template <class T, class U>
vector<T> make_v(U size, const T& init){ return vector<T>(static_cast<size_t>(size), init); }

template<class... Ts, class U>
auto make_v(U size, Ts... rest) { return vector<decltype(make_v(rest...))>(static_cast<size_t>(size), make_v(rest...)); }

template<class T> void chmin(T &a, const T &b){ a = (a < b ? a : b); }
template<class T> void chmax(T &a, const T &b){ a = (a > b ? a : b); }

int main() {
    int n, W, l;
    cin >> n >> W >> l;
    vector<int> xs, vs, ws;
    xs.emplace_back(0);
    vs.emplace_back(0);
    ws.emplace_back(0);
    for (int i = 0; i < n; ++i) {
        int x, v, w;
        scanf("%d %d %d", &x, &v, &w);
        xs.emplace_back(x);
        vs.emplace_back(v);
        ws.emplace_back(w);
    }
    xs.emplace_back(l);
    vs.emplace_back(0);
    ws.emplace_back(0);
    n = xs.size();
    auto dp = make_v(n, W+1, INF<ll>);
    dp[0][W] = 0;
    for (int i = 0; i < n-1; ++i) {
        for (int j = W; j >= 0; --j) {
            chmin(dp[i][min(W, j+vs[i])],dp[i][j]+ws[i]);
        }
        for (int j = xs[i+1]-xs[i]; j <= W; ++j) {
            chmin(dp[i+1][j-(xs[i+1]-xs[i])], dp[i][j]);
        }
    }
    ll ans = INF<ll>;
    for (int i = 0; i <= W; ++i) {
        chmin(ans, dp.back()[i]);
    }
    cout << (ans == INF<ll> ? -1 : ans)  << "\n";
    return 0;
}