import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;

public class D {

    public static void main(String[] args) throws IOException {
        init();

        available = new int[32];

        int n = nextInt(), q = nextInt();

        for (int i = 0; i < n; i++) {
            int pow = (int) (Math.log(nextInt())/Math.log(2));
            available[pow]++;
        }

        for (int i = 0; i < q; i++) {
            int num = nextInt();
            int[] currAvailable = Arrays.copyOf(available, available.length);

            System.out.println(make(num, currAvailable));
        }
    }

    private static int[] available;

    private static int make(int currNum, int[] currAvailable) {
        String num = new StringBuilder(Integer.toString(currNum, 2)).reverse().toString();

        boolean can = true;
        for (int i = num.length() - 1; i >= 0; i--) {
            if (num.charAt(i) == '1') {
                int start = i;
                int need = 1;

                while (need > 0 && start >= 0) {
                    int take = Math.min(need, currAvailable[start]);
                    currAvailable[start] -= take;
                    need -= take;
                    if (need > 0) need *= 2;
                    start--;
                }

                if (need > 0) {
                    can = false;
                    break;
                }
            }
        }

        if (!can) return -1;

        int answer = 0;
        for (int i = 0; i < currAvailable.length; i++) {
            answer += available[i] - currAvailable[i];
        }

        return answer;
    }

    //Input Reader
    private static BufferedReader reader;
    private static StringTokenizer tokenizer;

    private static void init() {
        reader = new BufferedReader(new InputStreamReader(System.in));
        tokenizer = new StringTokenizer("");
    }

    private static String next() throws IOException {
        String read;
        while (!tokenizer.hasMoreTokens()) {
            read = reader.readLine();
            if (read == null || read.equals(""))
                return "-1";
            tokenizer = new StringTokenizer(read);
        }

        return tokenizer.nextToken();
    }

    private static int nextInt() throws IOException {
        return Integer.parseInt(next());
    }
}