#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <math.h>
#include <vector>
#include <queue>
#include <map>
#include <utility>
using namespace std;

#define INF 1000000

int main(void)
{
    int n, c, v;
    cin >> n >> c >> v;

    vector<int> s(v), t(v), y(v), m(v);

    for (int i = 0; i < v; i++)
        scanf("%d", &s[i]);
    for (int i = 0; i < v; i++)
        scanf("%d", &t[i]);
    for (int i = 0; i < v; i++)
        scanf("%d", &y[i]);
    for (int i = 0; i < v; i++)
        scanf("%d", &m[i]);
    vector<vector<int> > time(n+1, vector<int>(c+1, INF));

    time[1][c] = 0;
    for (int i = 1; i <= n; i++)
        for (int j = c; j >= 0; j--)
        {
            if (time[i][j] != INF)
            {
                for(int k = 0; k < v; k++)
                    if(s[k]==i && time[i][j]+m[k]<time[t[k]][j-y[k]] && j-y[k]>=0)
                    {
                        time[t[k]][j-y[k]] = time[i][j] + m[k];
                    }
            }
        }

    int min = INF;
    for(int i = 0; i <= c; i++)
        if(min > time[n][i])
            min = time[n][i];
    cout << (min==INF?-1:min) << endl;
    return 0;
}