#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

const int INF = INT_MAX / 2;

class Edge
{
public:
    int to, cost, time;
    Edge(int to, int cost, int time){
        this->to = to;
        this->cost = cost;
        this->time = time;
    }
};

int main()
{
    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)
        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];

    vector<vector<Edge> > edges(n);
    for(int i=0; i<v; ++i){
        edges[s[i]-1].push_back(Edge(t[i]-1, y[i], m[i]));
        edges[t[i]-1].push_back(Edge(s[i]-1, y[i], m[i]));
    }

    vector<vector<int> > dp(n, vector<int>(c+1, INF));
    dp[0][c] = 0;
    for(int i=c; i>=0; --i){
        for(int j=0; j<n; ++j){
            for(unsigned k=0; k<edges[j].size(); ++k){
                if(i < edges[j][k].cost)
                    continue;
                int to = edges[j][k].to;
                int cost = edges[j][k].cost;
                dp[to][i-cost] = min(dp[to][i-cost], dp[j][i] + edges[j][k].time);
            }
        }
    }

    int ret = *min_element(dp[n-1].begin(), dp[n-1].end());
    if(ret < INF)
        cout << ret << endl;
    else
        cout << -1 << endl;

    return 0;
}