using System;
using System.Linq;
using System.Numerics;
using System.Collections.Generic;
using System.IO;
using System.Text;
using N = System.Int32;

public class Solver
{
    public void Solve(){
        int N = ri, C = ri, V = ri;
        int[] S = new int[V];
        int[] T = new int[V];
        int[] Y = new int[V];
        int[] M = new int[V];
        for(int i = 0; i < V; ++i){
            S[i] = ri - 1;
        }
        for(int i = 0; i < V; ++i){
            T[i] = ri - 1;
        }
        for(int j = 0; j < V; ++j){
            Y[j] = ri;
        }
        for(int j = 0; j < V; ++j){
            M[j] = ri;
        }

        long [,] dp = new long[N, C + 1];
        for(int i = 0; i < N; ++i){
            for(int j = 0; j <= C; ++j){
                dp[i, j] = mod;
            }
        }

        var G = new Dictionary<int, List<int>>();
        for(int i = 0; i < N; ++i){
            G[i] = new List<int>();
        }
        for(int i = 0; i < V; ++i){
            G[S[i]].Add(i);
        }
        dp[0, 0] = 0;
        for(int i = 0; i < N; ++i){
            for(int j = 0; j <= C; ++j){
                if(dp[i, j] == mod) continue;
                foreach(int k in G[i]){
                    if(j + Y[k] > C) continue;
                    dp[T[k], j + Y[k]] = Math.Min(dp[T[k], j + Y[k]], dp[i, j] + M[k]);
                }
            }
        }
        long ans = mod;
        for(int i = 0; i <= C; ++i){
            ans = Math.Min(ans, dp[N - 1, i]);
        }
        if(ans == mod) ans = -1;
        Write(ans);
    }

    int ri { get { return sc.Integer(); } }
    long rl { get { return sc.Long(); } }
    double rd { get { return sc.Double(); } }
    string rs { get { return sc.Scan(); } }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());

    
    private const N mod = 1000000007;
    N Reverse(N n) { return Pow(n, mod - 2); }
    N Mul(params N[] n) { N p = n[0]; for (N i = 1; i < n.Length; i++) { p = (p * n[i]) % mod; } return p; }
    N Pow(N n, N p) { N t = n, q = 1; while (p > 0) { if (p % 2 == 1) { q = (q * t) % mod; } t = (t * t) % mod; p >>= 1; } return q; }
    N PowUpper(N n, N b) { N p = 1; while (p <= n) { p *= b; } return p; }
    N Sign(N n) { return n == 0 ? 0 : n > 0 ? 1 : -1; }
    N Abs(N n) { return (n > 0) ? n : -n; }
    N Gcd(params N[] n) { N p = n[0]; for (N i = 1; i < n.Length; i++) { p = Gcd(p, n[i]); } return p; }
    N Gcd(N a, N b) { return (a == 0) ? b : Gcd(b % a, a); }
    N Lcm(params N[] n) { N p = n[0]; for (N i = 1; i < n.Length; i++) { p = Lcm(p, n[i]); } return p; }
    N Lcm(N a, N b) { return (a / Gcd(a, b) * b) % mod; }
    
    void Write<T>(T t) { Console.WriteLine(t.ToString()); }
    void YN(bool t) { Console.WriteLine(t ? "YES" : "NO"); }
    void Yn(bool t) { Console.WriteLine(t ? "Yes" : "No"); }
    void yn(bool t) { Console.WriteLine(t ? "yes" : "no"); }
}

static class Program
{
    static public void Main(string[] args)
    {
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}



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) throw new EndOfStreamException();
        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 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()
    {
        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 (int)Long(); }
    public double Double() { return double.Parse(Scan()); }
}