#include <bits/stdc++.h>
using namespace std;

#define MAX 1000000000

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];
		s[i]--;
	}
	for (int i = 0;i < v;i++) {
		cin >> t[i];
		t[i]--;
	}
	for (int i = 0;i < v;i++) {
		cin >> y[i];
	}
	for (int i = 0;i < v;i++) {
		cin >> m[i];
	}

	vector<vector<tuple<int,int,int>>> e(n);
	for (int i = 0;i < v;i++) {
		e[s[i]].push_back(make_tuple(t[i], y[i], m[i]));
	}
	vector<vector<int>> dp(n, vector<int>(c + 1, MAX));
	
	dp[0][0] = 0;
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < c + 1;j++) {
			if (dp[i][j] == MAX) {
				continue;
			}
			for (auto k : e[i]) {
				int ni = get<0>(k);
				int nj = j + get<1>(k);
				int nd = dp[i][j] + get<2>(k);
				if (nj < c + 1) {
					dp[ni][nj] = min(dp[ni][nj], nd);
				}
			}
		}
	}

	int ans = MAX;
	for (int i = 0;i < c + 1;i++) {
		ans = min(ans, dp[n - 1][i]);
	}
	cout << ((ans==MAX) ? -1 : ans) << endl;



	return 0;
}