import java.io.BufferedReader import java.io.InputStream import java.io.InputStreamReader import java.util.* import kotlin.math.abs import kotlin.math.max import kotlin.math.min val MOD = 1_000_000_007L data class Station(val x: Int, val v: Int, val w: Long) class Solver(stream: InputStream, private val out: java.io.PrintWriter) { fun solve() { val N = ni() val V = ni() val L = ni() val S = mutableListOf() for (i in 0 until N) { S += Station(ni(), ni(), nl()) } S += Station(L, 0, 100) val INF = Long.MAX_VALUE / 2 val dp = Array(N + 2){LongArray(V + 1){INF} } dp[0][V] = 0 var preX = 0 for (i in 0 .. N) { for (v in 0 .. V) { if (dp[i][v] == INF) continue val remain = v - (S[i].x - preX) if (remain < 0) continue dp[i + 1][remain] = min(dp[i + 1][remain], dp[i][v]) val filled = min(V, remain + S[i].v) dp[i + 1][filled] = min(dp[i + 1][filled], dp[i][v] + S[i].w) } preX = S[i].x } val ans = dp[N + 1].min() if (ans == INF) out.println(-1) else out.println(ans) } private val isDebug = try { // なんか本番でエラーでる System.getenv("MY_DEBUG") != null } catch (t: Throwable) { false } private var tokenizer: StringTokenizer? = null private val reader = BufferedReader(InputStreamReader(stream), 32768) private fun next(): String { while (tokenizer == null || !tokenizer!!.hasMoreTokens()) { tokenizer = StringTokenizer(reader.readLine()) } return tokenizer!!.nextToken() } private fun ni() = next().toInt() private fun nl() = next().toLong() private fun ns() = next() private fun na(n: Int, offset: Int = 0): IntArray { return map(n) { ni() + offset } } private fun nal(n: Int, offset: Int = 0): LongArray { val res = LongArray(n) for (i in 0 until n) { res[i] = nl() + offset } return res } private fun na2(n: Int, offset: Int = 0): Array { val a = Array(2){IntArray(n)} for (i in 0 until n) { for (e in a) { e[i] = ni() + offset } } return a } private inline fun map(n: Int, f: (Int) -> Int): IntArray { val res = IntArray(n) for (i in 0 until n) { res[i] = f(i) } return res } private inline fun debug(msg: () -> String) { if (isDebug) System.err.println(msg()) } private fun debug(a: LongArray) { debug { a.joinToString(" ") } } private fun debug(a: IntArray) { debug { a.joinToString(" ") } } private fun debug(a: BooleanArray) { debug { a.map { if (it) 1 else 0 }.joinToString("") } } private fun debugDim(A: Array) { if (isDebug) { for (a in A) { debug(a) } } } /** * 勝手にimport消されるのを防ぎたい */ private fun hoge() { min(1, 2) max(1, 2) abs(-10) } } fun main() { val out = java.io.PrintWriter(System.out) Solver(System.`in`, out).solve() out.flush() }