using System;
using System.Collections.Generic;
using System.Linq;
using Enu = System.Linq.Enumerable;

class Solution {
    public const int INF = (int)1e9;
    int N, C, V;
    int[] S, T, Y, M;
    void calc() {
        N = ri();
        C = ri();
        V = ri();
        S = ria(V);
        T = ria(V);
        Y = ria(V);
        M = ria(V);

        var dijkstra = new Algorithm.Dijkstra(N, C);

        for (int i = 0; i < V; i++) {
            dijkstra.addDirEdge(S[i], T[i], Y[i], M[i]);
        }

        dijkstra.calcShortestPath(1);

        int ans = INF;
        for (int c = 0; c <= C; c++) {
            ans = Math.Min(ans, dijkstra.d[N, c]);
        }

        Console.WriteLine(ans != INF ? ans : -1);
    }

    static void Main(string[] args) {
        new Solution().calc();
    }

    #region
    static int ri() { return int.Parse(Console.ReadLine()); }
    static int[] ria(int n) {
        if (n <= 0) { Console.ReadLine(); return new int[0]; }
        else return Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToArray();
    }
    static void rio(out int p1) { p1 = ri(); }
    static void rio(out int p1, out int p2) { var r = ria(2); p1 = r[0]; p2 = r[1]; }
    static void rio(out int p1, out int p2, out int p3) { var r = ria(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; }
    static void rio(out int p1, out int p2, out int p3, out int p4) { var r = ria(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; }
    static void rio(out int p1, out int p2, out int p3, out int p4, out int p5) { var r = ria(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; }
    static long rl() { return long.Parse(Console.ReadLine()); }
    static long[] rla(int n) {
        if (n <= 0) { Console.ReadLine(); return new long[0]; }
        else return Console.ReadLine().Trim().Split(' ').Select(long.Parse).ToArray();
    }
    static void rlo(out long p1) { p1 = rl(); }
    static void rlo(out long p1, out long p2) { var r = rla(2); p1 = r[0]; p2 = r[1]; }
    static void rlo(out long p1, out long p2, out long p3) { var r = rla(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; }
    static void rlo(out long p1, out long p2, out long p3, out long p4) { var r = rla(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; }
    static void rlo(out long p1, out long p2, out long p3, out long p4, out long p5) { var r = rla(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; }
    static double rd() { return double.Parse(Console.ReadLine()); }
    static double[] rda(int n) {
        if (n <= 0) { Console.ReadLine(); return new double[0]; }
        else return Console.ReadLine().Trim().Split(' ').Select(double.Parse).ToArray();
    }
    static void rdo(out double p1) { p1 = rd(); }
    static void rdo(out double p1, out double p2) { var r = rda(2); p1 = r[0]; p2 = r[1]; }
    static void rdo(out double p1, out double p2, out double p3) { var r = rda(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; }
    static void rdo(out double p1, out double p2, out double p3, out double p4) { var r = rda(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; }
    static void rdo(out double p1, out double p2, out double p3, out double p4, out double p5) { var r = rda(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; }
    static void swap<T>(ref T x, ref T y) { T temp = x; x = y; y = temp; }
    static void wa1<T>(T[] a) { Console.WriteLine(string.Join(" ", a)); }
    static void wa2<T>(T[,] a) {
        for (int i = 0; i < a.GetLength(0); i++) {
            for (int j = 0; j < a.GetLength(1); j++) Console.Write(a[i, j] + " ");
            Console.WriteLine();
        }
    }
    #endregion
}

namespace Algorithm {
    using T = System.Int32;
    // require PriorityQueue
    public class Dijkstra {
        public const T INF = (T)1e9;
        public int maxCost;
        private class edge {
            public int from, to;
            public T cost, time;
            public edge(int from, int to, T cost, T time) {
                this.from = from; this.to = to; this.cost = cost; this.time = time;
            }
        }
        private int vnum;
        private List<edge>[] edgelists;
        public T[,] d;
        private PriorityQueue<Tuple<T, T, int>> que; // Item1:コスト, Item2:時間, Item3:頂点番号

        public Dijkstra(int vnum, int maxCost) {
            this.vnum = vnum;
            this.maxCost = maxCost;
            edgelists = new List<edge>[vnum + 1];
            for (int i = 0; i < edgelists.Length; i++)
                edgelists[i] = new List<edge>();
            d = new T[vnum + 1, maxCost + 1];
        }
        public void addDirEdge(int v1, int v2, T cost, T time) {
            edgelists[v1].Add(new edge(v1, v2, cost, time));
        }
        public void addUnDirEdge(int v1, int v2, T cost, T time) {
            addDirEdge(v1, v2, cost, time);
            addDirEdge(v2, v1, cost, time);
        }
        public void calcShortestPath(int s) {
            for (int i = 0; i <= vnum; i++) {
                for (int j = 0; j <= maxCost; j++) {
                    d[i, j] = INF;
                }
            }
            que = new PriorityQueue<Tuple<T, T, int>>((t1, t2) => t2.Item2.CompareTo(t1.Item2));
            d[s, 0] = 0;
            que.Push(new Tuple<T, T, int>(0, 0, s));

            while (que.Count() != 0) {
                var t = que.Pop();
                int v = t.Item3;
                if (d[v, t.Item1] < t.Item2) continue;
                foreach (var e in edgelists[v]) {
                    int nextCost = e.cost + t.Item1;
                    if (nextCost <= maxCost && d[e.to, nextCost] > d[v, t.Item1] + e.time) {
                        d[e.to, nextCost] = d[v, t.Item1] + e.time;
                        que.Push(new Tuple<T, T, int>(nextCost, d[e.to, nextCost], e.to));
                    }
                }
            }
        }
    }
    public class PriorityQueue<T> {
        private List<T> buffer;
        private Comparison<T> comp;
        // 昇順
        // (e1, e2) => e2.CompareTo(e1)  
        // 降順
        // (e1, e2) => e1.CompareTo(e2)
        public PriorityQueue(Comparison<T> comp) {
            buffer = new List<T>();
            this.comp = comp;
        }
        public PriorityQueue(Comparison<T> comp, IEnumerable<T> data)
            : this(comp) {
            foreach (T e in data) Push(e);
        }

        public void Push(T elem) { PushHeap(this.buffer, elem); }
        public T Pop() { return PopHeap(this.buffer); }
        public int Count() { return buffer.Count; }

        public T Top() { return buffer[0]; }
        private void PushHeap(List<T> array, T elem) {
            int n = array.Count;
            array.Add(elem);

            while (n != 0) {
                int i = (n - 1) / 2;
                // 親と値を入れ替え
                if (comp(array[n], array[i]) > 0) {
                    T tmp = array[n]; array[n] = array[i]; array[i] = tmp;
                }
                n = i;
            }
        }

        private T PopHeap(List<T> array) {
            int n = array.Count - 1;
            T returnelem = array[0];
            array[0] = array[n];
            array.RemoveAt(n);

            for (int i = 0, j; (j = 2 * i + 1) < n; ) {
                // 値の大きい方の子を選ぶ
                if ((j != n - 1) && (comp(array[j], array[j + 1]) < 0))
                    j++;
                // 子と値を入れ替え
                if (comp(array[i], array[j]) < 0) {
                    T tmp = array[j]; array[j] = array[i]; array[i] = tmp;
                }
                i = j;
            }
            return returnelem;
        }
    }
}