import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int volume = sc.nextInt();
        int length = sc.nextInt();
        int prev = 0;
        long[][] dp = new long[n + 1][volume + 1];
        for (int i = 1; i <= n; i++) {
            Arrays.fill(dp[i], Long.MAX_VALUE / 2);
            int x = sc.nextInt();
            int v = sc.nextInt();
            int cost = sc.nextInt();
            int dist = x - prev;
            for (int j = volume; j - dist >= 0; j--) {
                dp[i][j - dist] = dp[i - 1][j];
            }
            for (int j = volume; j >= 1; j--) {
                dp[i][j] = Math.min(dp[i][j], dp[i][Math.max(0, j - v)] + cost);
            }
            prev = x;
        }
        int current = length - prev;
        long ans = current <= volume ? dp[n][current] : Long.MAX_VALUE / 2;
        System.out.println(ans >= Long.MAX_VALUE / 2 ? -1 : ans);
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}