using System;
using System.Linq;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using StringBuilder = System.Text.StringBuilder;
//using System.Numerics;
namespace Program
{
    public class Solver
    {
        public void Solve()
        {
            var n = sc.Integer();
            var c = sc.Integer();
            var m = sc.Integer();
            var s = sc.Integer(m);
            var t = sc.Integer(m);
            for (int i = 0; i < m; i++)
            {
                s[i]--; t[i]--;
            }
            var cost = sc.Integer(m);
            var dt = sc.Integer(m);
            var G = Enumerate(n, x => new List<Trinity<int>>());
            for (int i = 0; i < m; i++)
            {
                G[s[i]].Add(new Trinity<int>(t[i], cost[i], dt[i]));
                G[t[i]].Add(new Trinity<int>(s[i], cost[i], dt[i]));
            }
            var dp = new long[n, c + 1];
            for (int i = 0; i < n; i++)
                for (int j = 0; j <= c; j++)
                    dp[i, j] = long.MaxValue;
            dp[0, 0] = 0;
            var q = new Queue<int>();
            var inQ = new bool[n];
            q.Enqueue(0);
            while (q.Any())
            {
                var p = q.Dequeue();
                inQ[p] = false;
                for (int i = 0; i <= c; i++)
                {
                    if (dp[p, i] == long.MaxValue) continue;
                    foreach (var next in G[p])
                    {
                        var to = next.I;
                        var u = i + next.J;
                        var v = dp[p, i] + next.K;
                        if (u > c) continue;
                        if (v < dp[to, u])
                        {
                            dp[to, u] = v;
                            if (!inQ[to])
                            {
                                q.Enqueue(to);
                                inQ[to] = true;
                            }
                        }
                    }
                }

            }
            var min = long.MaxValue;
            for (int i = 0; i <= c; i++)
                min = Math.Min(min, dp[n - 1, i]);
            if (min == long.MaxValue) min = -1;
            IO.Printer.Out.WriteLine(min);
        }
        internal IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());
        static T[] Enumerate<T>(int n, Func<T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(); return a; }
        static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; }
    }
}

#region Ex
namespace Program.IO
{
    using System.IO;
    using System.Linq;
    public class Printer : StreamWriter
    {
        static Printer()
        {
            Out = new Printer(Console.OpenStandardOutput()) { AutoFlush = false };
        }
        public static Printer Out { get; set; }
        public override IFormatProvider FormatProvider { get { return System.Globalization.CultureInfo.InvariantCulture; } }
        public Printer(System.IO.Stream stream) : base(stream, new System.Text.UTF8Encoding(false, true)) { }
        public void Write<T>(string format, IEnumerable<T> source) { base.Write(format, source.OfType<object>().ToArray()); }
        public void WriteLine<T>(string format, IEnumerable<T> source) { base.WriteLine(format, source.OfType<object>().ToArray()); }
    }
    public class StreamScanner
    {
        public StreamScanner(Stream stream) { str = stream; }
        private readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }
        private byte read()
        {
            if (isEof) return 0;
            if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } }
            return buf[ptr++];
        }
        public char Char() { byte b = 0; do b = read(); while (b < 33 || 126 < b); return (char)b; }
        public char[] Char(int n) { var a = new char[n]; for (int i = 0; i < n; i++) a[i] = Char(); return a; }
        public string Scan()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public long Long()
        {
            if (isEof) return long.MinValue;
            long ret = 0; byte b = 0; var ng = false;
            do b = read();
            while (b != '-' && (b < '0' || '9' < b));
            if (b == '-') { ng = true; b = read(); }
            for (; true; b = read())
            {
                if (b < '0' || '9' < b)
                    return ng ? -ret : ret;
                else ret = ret * 10 + b - '0';
            }
        }
        public int Integer() { return (isEof) ? int.MinValue : (int)Long(); }
        public double Double() { return double.Parse(Scan(), System.Globalization.CultureInfo.InvariantCulture); }
        private T[] enumerate<T>(int n, Func<T> f)
        {
            var a = new T[n];
            for (int i = 0; i < n; ++i) a[i] = f();
            return a;
        }

        public string[] Scan(int n) { return enumerate(n, Scan); }
        public double[] Double(int n) { return enumerate(n, Double); }
        public int[] Integer(int n) { return enumerate(n, Integer); }
        public long[] Long(int n) { return enumerate(n, Long); }
        public void Flush() { str.Flush(); }

    }
}
static class Ex
{
    static public string AsString(this IEnumerable<char> ie) { return new string(System.Linq.Enumerable.ToArray(ie)); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") { return string.Join(st, ie); }
    static public void Main()
    {
        var solver = new Program.Solver();
        solver.Solve();
        Program.IO.Printer.Out.Flush();
    }
}
#endregion
#region Trinity<T>

public struct Trinity<T>
{
    public T I, J, K;
    public Trinity(T i, T j, T k) : this() { I = i; J = j; K = k; }
    public Trinity(params T[] arg) : this(arg[0], arg[1], arg[2]) { }
    public override string ToString() { return string.Format("{0} {1} {2}", I, J, K); }
}
#endregion