import java.util.*;
import java.awt.geom.*;
import java.io.*;

class Main {
	static int[] vx = {1,0,-1,0};
	static int[] vy = {0,1,0,-1};
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int c = sc.nextInt();
		int v = sc.nextInt();
		int[] s = new int[v];
		int[] t = new int[v];
		int[] y = new int[v];
		int[] m = new int[v];
		
		for(int i = 0; i < v; i++){
			s[i] = sc.nextInt()-1;
		}
		for(int i = 0; i < v; i++) {
			t[i] = sc.nextInt()-1;
		}
		for(int i = 0; i < v; i++) {
			y[i] = sc.nextInt();
		}
		for(int i = 0; i < v; i++) {
			m[i] = sc.nextInt();
		}
		int[][] dp = new int[n][c+1];
		for(int i = 0; i < n; i++) {
			Arrays.fill(dp[i], 2 << 28);
		}
		dp[0][0] = 0;
		for(int i = 0; i < n-1; i++) {
			for(int j = 0; j < c; j++) {
				for(int k = 0; k < v; k++) {
					if(s[k] != i || j + y[k] > c) continue;
					dp[t[k]][j + y[k]] = Math.min(dp[t[k]][j + y[k]],dp[i][j] + m[k]);
				}
			}
		}
		int min = dp[n-1][0];
		for(int i= 1; i <= c; i++) {
			min = Math.min(min, dp[n-1][i]);
		}
		System.out.println((min==2<<28?-1:min));
		
		
	}
}