#include <iostream>
#include <string>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <vector>
#include <cmath>
#include <cstdlib>
#include <queue>
#include <stack>
#include <iomanip>

using namespace std;

#define REP(i, n) for(ll i = 0;i < n;i++)
#define REPR(i, n) for(ll i = n;i >= 0;i--)
#define FOR(i, m, n) for(ll i = m;i < n;i++)
#define FORR(i, m, n) for(ll i = m;i >= n;i--)
#define REPO(i, n) for(ll i = 1;i <= n;i++)
#define ll long long
#define INF (ll)1 << 60
#define MINF (-1 * INF)
#define ALL(n) n.begin(),n.end()
#define MOD 1000000007
#define P pair<ll, ll>

ll n, c, m, ans = INF;
#define PP pair<ll, P>
ll d[60][310]; // 結果
struct edge { ll to, cost, coin; };
vector<edge> g[110000]; //隣接リスト to, cost

void dijkstra(ll a) { //実装汚いからそのうち直す
	priority_queue<PP, vector<PP>, greater<PP> > q; // to, cost, 条件
	REP(i, n)fill(d[i], d[i] + 310, INF);

	d[a][0] = 0;
	q.push(PP(0, P(a, 0)));
	while (!q.empty()) {
		PP p = q.top();
		q.pop();
		ll v = p.second.first;
		if (d[v][p.second.second] < p.first) continue;
		REP(i, g[v].size()) {
			edge e = g[v][i];
			if (p.second.second + e.coin > 300)continue;
			if (d[e.to][p.second.second + e.coin] > d[v][p.second.second] + e.cost) {
				d[e.to][p.second.second + e.coin] = d[v][p.second.second] + e.cost;
				q.push(PP(d[e.to][p.second.second + e.coin], P(e.to, p.second.second + e.coin)));
			}
		}
	}
}

int main() {
	cin >> n >> c >> m;
	vector<ll> i1(m), i2(m), i3(m), i4(m);
	REP(i, m) {
		cin >> i1[i];
		i1[i]--;
	}
	REP(i, m) {
		cin >> i2[i];
		i2[i]--;
	}
	REP(i, m) cin >> i3[i];
	REP(i, m) cin >> i4[i];
	REP(i, m) g[i1[i]].push_back({ i2[i],i4[i],i3[i] });
	dijkstra(0);
	REP(i, c + 1)ans = min(ans, d[n - 1][i]);
	if (ans == INF)cout << -1 << endl;
	else cout << ans << endl;
}