#include <iostream>
using namespace std;




int goforward(int N, int C, int V, int S[], int T[], int Y[], int M[], int start, int curcost, int curtime) {
    if (start == N) {
        return curtime;
    }
    int smallest = 1e+7;
    for (int i = 0; i < V; i++) {
        if (S[i] == start) {
            int nexcost = curcost + Y[i];
            if (nexcost > C) {continue;}
            int nextime = curtime + M[i];
            int result = goforward(N, C, V, S, T, Y, M, T[i], nexcost, nextime);
            //cout << start << " -> " << T[i] << ": " << result << endl;
            smallest = min(smallest, result);
        }
    }
    return smallest;
}

int main(void) {
    int N, C, V;
    cin >> N;
    cin >> C;
    cin >> V;

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


    for (int i = 0; i < V; i++) {
        cin >> T[i];
    }

    for (int i = 0; i < V; i++) {
        cin >> Y[i];
    }

    for (int i = 0; i < V; i++) {
        cin >> M[i];
    }

    int result = goforward(N, C, V, S, T, Y, M, 1, 0, 0);
    if (result >= 1e+7) {result = -1;}

    cout << result << endl;

    return 0;
}