#include <iostream>
#include <algorithm>
#include <map>
using namespace std;
typedef struct data{
	int money;
	int time;
}data;

int N, C, V;
int S[1500], T[1500], Y[1500], M[1500];
map<int, map<int,data> > keiro;

int loop(int pos, int money, int time, int min_time){
	if(money<0){
		return -1;
	}
	if(pos == N){
		return time;
	}
	for(int i=1; i<=N; i++){
		if(keiro[pos].find(i) != keiro[pos].end()){
			int tmp = loop(i, money-keiro[pos][i].money, time+keiro[pos][i].time, min_time);
			if(tmp == -1) continue;
			if(min_time == -1){
				min_time = tmp;
			}else{
				min_time = min(min_time, tmp);
			}
		}
	}
	return min_time;
}

int main(int argc, char const *argv[])
{
	cin >> N >> C >> 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){
		keiro[S[i]][T[i]].money = Y[i];
		keiro[S[i]][T[i]].time = M[i];
	}

	cout << loop(1, C, 0, -1) << endl;

	return 0;
}