#include <bits/stdc++.h>
using namespace std;

void chmin(int64_t& a, int64_t b){
    a = min(a, b);
}

int main(){
    int N, M, L;
    cin >> N >> M >> L;
    vector<int> X(N+2), V(N+2), W(N+2);
    for(int i=1; i<=N; i++) cin >> X[i] >> V[i] >> W[i];
    X[N+1] = L;

    vector<vector<int64_t>> dp(N+2, vector<int64_t>(M+1, 1e18));
    dp[0][M] = 0;
    for(int i=0; i<=N; i++){
        for(int j=M; j>=0; j--) chmin(dp[i][min(M, j+V[i])], dp[i][j] + W[i]);
        int d = X[i+1] - X[i];
        for(int j=d; j<=M; j++) chmin(dp[i+1][j-d], dp[i][j]);
    }
    int64_t ans = *min_element(dp[N+1].begin(), dp[N+1].end());
    if(ans == 1e18) ans = -1;
    cout << ans << endl;
    return 0;
}