import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static int[] value;
    static int[] amount;
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int x = sc.nextInt();
        int[] points = new int[n];
        int count = 0;
        for (int i = 0; i < n; i++) {
            points[i] = sc.nextInt() - x;
            if (points[i] < 0) {
                count++;
            }
        }
        if (count == n) {
            System.out.println(-1);
            return;
        }
        int[] costs = new int[n];
        for (int i = 0; i < n; i++) {
            costs[i] = sc.nextInt();
        }
        value = new int[count];
        amount = new int[count];
        int idx = 0;
        int total = 0;
        for (int i = 0; i < n; i++) {
            if (points[i] < 0) {
                value[idx] = points[i];
                amount[idx] = costs[i];
                idx++;
            } else {
                total += points[i];
            }
        }
        dp = new int[count][total + 1];
        for (int[] arr : dp) {
            Arrays.fill(arr, -1);
        }
        System.out.println(dfw(count - 1, total));
    }
    
    static int dfw(int idx, int v) {
        if (v < 0) {
            return Integer.MAX_VALUE / 2;
        }
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][v] < 0) {
            dp[idx][v] = Math.min(dfw(idx - 1, v) + amount[idx], dfw(idx - 1, v + value[idx]));
        }
        return dp[idx][v];
    }
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}