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

public class Main {
    public static void main(String[] args) throws IOException {
        InputReader in = new InputReader();
        PrintWriter out = new PrintWriter(System.out);
        int t = 1;
        Solver s = new Solver();
        for (int i = 1; i <= t; i++) {
            s.solve(i, in, out);
        }
        out.close();
    }
}

class Solver {

    void solve(int test, InputReader in, PrintWriter out) throws IOException {
        int n = in.nextInt();
        int q = in.nextInt();
        HashMap<Long, Integer> map = new HashMap<>();
        for (int i = 0; i < n; i++) {
            long e = in.nextInt();
            if (map.containsKey(e)) {
                map.put(e, map.get(e) + 1);
            } else {
                map.put(e, 1);
            }
        }
        long[] p = new long[40];
        p[0] = 1;
        for (int i = 1; i < p.length; i++) p[i] = 2 * p[i - 1];
        while (q-- > 0) {
            int as = in.nextInt();
            String s = getBinary(as);
            ArrayList<Pair> v = new ArrayList<Pair>();
            for (int i = 0; i < s.length(); i++) {
                if (s.charAt(i) == '1') {
                    int cnt = 1;
                    long curr = p[i];
                    while (curr > 0) {
                        Integer e = map.get(curr);
                        if (e != null && e >= cnt) {
                            e -= cnt;
                            v.add(new Pair(curr, cnt));
                            map.put(curr, e);
                            break;
                        } else {
                            curr /= 2;
                            cnt *= 2;
                        }
                    }
                }
            }
            long ans = 0;
            int sum = 0;
            for (Pair x : v) {
                map.put(x.e, map.get(x.e) + x.t);
                ans += x.t * x.e;
                sum += x.t;
            }
            if (ans == as) {
                out.println(sum);
            } else {
                out.println(-1);
            }
        }
    }

    private String getBinary(int x) {
        StringBuilder sb = new StringBuilder();
        while (x > 0) {
            sb.append(x % 2);
            x /= 2;
        }
        return sb.toString();
    }

    private class Pair {
        long e;
        int t;

        public Pair(long e, int t) {
            this.e = e;
            this.t = t;
        }
    }
}

class InputReader {
    final private int BUFFER_SIZE = 1 << 16;
    private DataInputStream din;
    private byte[] buffer;
    private int bufferPointer, bytesRead;

    public InputReader() {
        din = new DataInputStream(System.in);
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public InputReader(String file_name) throws IOException {
        din = new DataInputStream(new FileInputStream(file_name));
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public String nextLine() throws IOException {
        byte[] buf = new byte[64]; // line length
        int cnt = 0, c;
        while ((c = read()) != -1) {
            if (c == '\n')
                break;
            buf[cnt++] = (byte) c;
        }
        return new String(buf, 0, cnt);
    }

    public int nextInt() throws IOException {
        int ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do {
            ret = ret * 10 + c - '0';
        } while ((c = read()) >= '0' && c <= '9');

        if (neg)
            return -ret;
        return ret;
    }

    public long nextLong() throws IOException {
        long ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');
        if (neg)
            return -ret;
        return ret;
    }

    public double nextDouble() throws IOException {
        double ret = 0, div = 1;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();

        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');

        if (c == '.') {
            while ((c = read()) >= '0' && c <= '9') {
                ret += (c - '0') / (div *= 10);
            }
        }

        if (neg)
            return -ret;
        return ret;
    }

    private void fillBuffer() throws IOException {
        bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
        if (bytesRead == -1)
            buffer[0] = -1;
    }

    private byte read() throws IOException {
        if (bufferPointer == bytesRead)
            fillBuffer();
        return buffer[bufferPointer++];
    }

    public void close() throws IOException {
        if (din == null)
            return;
        din.close();
    }

    public String next() throws IOException {
        byte[] buf = new byte[(int) 1e7]; // line length
        int cnt = 0, c;
        while ((c = read()) != -1) {
            if (c == '\n' || c == ' ')
                break;
            buf[cnt++] = (byte) c;
        }
        return new String(buf, 0, cnt);
    }
}