#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
#define rep(i,n) for(int i = 0;i < n;i++)
#define P(p) cout<<(p)<<endl;
using namespace std;
typedef long long ll;
int dx[] = { 0, 1, 0, -1 };
int dy[] = { -1, 0, 1, 0 };

int sttoi(std::string str) {
	int ret;
	std::stringstream ss; ss << str;
	ss >> ret;
	return ret;
}

ll gcd(ll a, ll b){
	if (b > a)swap(a, b); if (b == 0)return a; else{ return gcd(b, a%b); }
}

void solve() {
	int n, c, v, s[100], t[100], y[1000], m[1000];
	pair<int, int> dp[100];
	cin >> n >> c >> v;
	rep(i, v)cin >> s[i];
	rep(i, v)cin >> t[i];
	rep(i, v)cin >> y[i];
	rep(i, v)cin >> m[i];
	rep(i, n+1)dp[i] = make_pair(1e9,0);
	dp[1].first = 0;
	for (int i = 1; i <= n; i++){
		for (int j = 0; j < v; j++){
			if (s[j] == i && dp[i].second + y[j] <= c){
				if ((dp[t[j]].first > dp[i].first + m[j]) || (dp[t[j]].first == dp[i].first + m[j] && dp[i].second + y[i] < dp[t[j]].second)){
					dp[t[j]].first = dp[i].first + m[j];
					dp[t[j]].second = dp[i].second + y[j];
				}
			}
		}
	}
	P(dp[n].first != 1e9 ? dp[n].first : -1);
}

int main() {
	solve();
	return 0;
}