#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
using namespace std;

#define MAX_VAL 10101010

int N,C,V;
int memo[51][301];
int map[2][51][51];
int ret;

int recursive(int cur_node, int cur_cost) {
    int min_dist = MAX_VAL;
    if (memo[cur_node][cur_cost] != MAX_VAL) return memo[cur_node][cur_cost];
    if (cur_node == N) return 0;
    for (int n = 1; n <= N; n++) {
        if (map[0][cur_node][n] == -1) continue;
        if ((cur_cost+map[1][cur_node][n]) > C) continue;
        int min_dist_tmp = recursive(n, cur_cost+map[1][cur_node][n])+map[0][cur_node][n];
        min_dist = min(min_dist, min_dist_tmp);
    }
//    cout << "cur_node = " << cur_node << " cur_cost = " << cur_cost << " min_dist = " << min_dist << endl;
    memo[cur_node][cur_cost] = min_dist;
    return min_dist;
}

int main() {
    cin >> N >> C >> V;
    vector<int> S(V);
    vector<int> T(V);
    vector<int> Y(V);
    vector<int> 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];
    
    for (int n = 0; n <= N; n++)
        for (int c = 0; c <= C; c++) { memo[n][c] = MAX_VAL; }
    
    for (int k = 0; k < 2; k++)
        for (int j = 0; j < 51; j++)
            for (int i = 0; i < 51; i++)
                map[k][j][i] = -1;
    for (int i = 0; i < V; i++) { map[0][S[i]][T[i]] = M[i]; map[1][S[i]][T[i]] = Y[i]; }
//    for (int c = 0; c <= C; c++) dp[1][c] = 0;

    int ret = recursive(1, 0);
    if (ret == MAX_VAL) ret = -1;
    cout << ret << endl;
    
//            for (int n_f = 1; n_f <= N; n_f++)
//    int ret = MAX_VAL;
//    for (int c = 0; c <= C; c++) {
//        ret = min(ret,memo[N][c]);
//    }
//    cout << ret << endl;
    
//    for (int k = 1; k <= N; k++)
//        for (int j = 1; j <= N; j++)
//            for (int i = 1; i <= N; i++) {
//                if (dp[0][i][j]<dp[0][i][k]+dp[0][k][j]) {
//                    //                    dp[0][i][j] = dp[0][i][j];
//                }
//                else {
//                    if (dp[1][i][k]+dp[1][k][j] <= C) {
//                        dp[0][i][j] = dp[0][i][k]+dp[0][k][j];
//                        dp[1][i][j] = dp[1][i][k]+dp[1][k][j];
//                    }
//                }
//                //                dp[0][i][j] = min(dp[0][i][j], dp[0][i][k]+dp[0][k][j]);
//            }
//    
//    cout << ((dp[0][1][N] == 101010)?-1:dp[0][1][N]) << endl;
    //    cout << dp[1][1][N] << endl;
    return 0;
    
//    int dp[2][51][51];
//    for (int j = 0; j <= N; j++)
//        for (int i = 0; i <= N; i++) { dp[0][j][i] = dp[1][j][i] = 101010; }
//    
//    for (int i = 0; i < V; i++) { dp[0][S[i]][T[i]] = M[i]; dp[1][S[i]][T[i]] = Y[i]; }
//    
//    for (int k = 1; k <= N; k++)
//        for (int j = 1; j <= N; j++)
//            for (int i = 1; i <= N; i++) {
//                if (dp[0][i][j]<dp[0][i][k]+dp[0][k][j]) {
////                    dp[0][i][j] = dp[0][i][j];
//                }
//                else {
//                    if (dp[1][i][k]+dp[1][k][j] <= C) {
//                        dp[0][i][j] = dp[0][i][k]+dp[0][k][j];
//                        dp[1][i][j] = dp[1][i][k]+dp[1][k][j];
//                    }
//                }
////                dp[0][i][j] = min(dp[0][i][j], dp[0][i][k]+dp[0][k][j]);
//            }
//    
//    cout << ((dp[0][1][N] == 101010)?-1:dp[0][1][N]) << endl;
////    cout << dp[1][1][N] << endl;
//    return 0;
}