#include <iostream>
using namespace std;

int n, c, v;
int *s, *t, *y, *m;

int main()
{

    int now, brg, cost, time, flag;
    int rt = -1;
    cin >> n >> c >> v;
    s = new int[v];
    t = new int[v];
    y = new int[v];
    m = new int[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 i = 0; i < v; i++)
        if (t[i] == n)
        {
            now = s[i];
            cost = y[i];
            time = m[i];
            while (now != 1)
            {
                flag = 0;
                for (int j = 0; j < v; j++)
                    if (t[j] == now)
                    {
                        flag = 1;
                        now = s[j];
                        cost += y[j];
                        time += m[j];
                        break;
                    }
                if (flag == 0)
                    break;
            }
            if (now == 1 && cost <= c && (rt > time || rt < 0))
                rt = time;
        }
    cout << rt << endl;

    return 0;
}