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

public class A {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(reader.readLine());
        int n = Integer.parseInt(st.nextToken());
        int q = Integer.parseInt(st.nextToken());
        st = new StringTokenizer(reader.readLine());

        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < n; i++) {
            int curr = Integer.parseInt(st.nextToken());
            int pow = 0;
            while (curr % 2 == 0) {
                curr /= 2;
                pow++;
            }

            if (map.containsKey(pow)) {
                map.put(pow, map.get(pow) + 1);
            } else {
                map.put(pow, 1);
            }
        }

        for (int i = 0; i < q; i++) {
            st = new StringTokenizer(reader.readLine());
            int curr = Integer.parseInt(st.nextToken());
            List<Integer> list = new ArrayList<>(35);
            while (curr > 0) {
                list.add(curr % 2);
                curr /= 2;
            }

            int answer = 0;
            int prev = 0;
            for (int j = list.size() - 1; j >= 0; j--) {
                if (list.get(j) == 1) {
                    prev++;
                }
                if (map.containsKey(j)) {
                    if (map.get(j) >= prev) {
                        answer += prev;
                        prev = 0;
                    } else {
                        answer += map.get(j);
                        prev -= map.get(j);
                    }
                }
                prev *= 2;
            }

            if (prev == 0) {
                System.out.println(answer);
            } else {
                System.out.println(-1);
            }
        }
        //scanner.close();
        reader.close();
    }
}