#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)
#define MAX_N 51

int N, C, V;

int DP[301][51];

int main()
{
	cin >> N >> C >> V;
	vector<int> S(V), T(V), Y(V), M(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];

	for (int i = 0; i <= C ; i++) {
		for (int j = 1; j <= N; j++) {
			DP[i][j] = INT32_MAX;
		}
	}

	DP[C][1] = 0;
	
	for (int i = C; i >=0; i--) {
		for (int j = 1; j <= N; j++) {
			if (DP[i][j] == INT32_MAX) continue;

			for (int k = 0; k < V; k++) {
				if (j == S[k]) {
					if (i - Y[k] < 0)continue;
					DP[i - Y[k]][T[k]] = min(DP[i - Y[k]][T[k]], DP[i][j] + M[k]);
				}
			}
		}
	}

	int mn = INT32_MAX;
	for (int i = 0; i <= C; i++) {
		mn = min(mn, DP[i][N]);
	}
	if (mn == INT32_MAX)cout << -1 << endl;
	else cout << mn << endl;

    return 0;
}