import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int c = sc.nextInt();
        int v = sc.nextInt();
        ArrayList<ArrayList<Route>> graph = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            graph.add(new ArrayList<>());
        }
        int[] ss = new int[v];
        for (int i = 0; i < v; i++) {
            ss[i] = sc.nextInt() - 1;
        }
        int[] ts = new int[v];
        for (int i = 0; i < v; i++) {
            ts[i] = sc.nextInt() - 1;
        }
        int[] ys = new int[v];
        for (int i = 0; i < v; i++) {
            ys[i] = sc.nextInt();
        }
        for (int i = 0; i < v; i++) {
            graph.get(ss[i]).add(new Route(ts[i], ys[i], sc.nextInt()));
        }
        PriorityQueue<Route> queue = new PriorityQueue<>();
        queue.add(new Route(0, 0, 0));
        int[][] costs = new int[n][c + 1];
        for (int[] arr : costs) {
            Arrays.fill(arr, Integer.MAX_VALUE);
        }
        while (queue.size() > 0) {
            Route r = queue.poll();
            if (r.yen > c || costs[r.idx][r.yen] <= r.time) {
                continue;
            }
            costs[r.idx][r.yen] = r.time;
            for (Route x : graph.get(r.idx)) {
                queue.add(new Route(x.idx, r.yen + x.yen, r.time + x.time));
            }
        }
        int ans = Integer.MAX_VALUE;
        for (int x : costs[n - 1]) {
            ans = Math.min(ans, x);
        }
        if (ans == Integer.MAX_VALUE) {
            System.out.println(-1);
        } else {
            System.out.println(ans);
        }
    }
    
    static class Route implements Comparable<Route> {
        int idx;
        int yen;
        int time;
        
        public Route(int idx, int yen, int time) {
            this.idx = idx;
            this.yen = yen;
            this.time = time;
        }
        
        public int compareTo(Route r) {
            return time - r.time;
        }
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String nextLine() throws Exception {
        return br.readLine();
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}