#include <bits/stdc++.h>
using namespace std;
bool vis[2005];
void prime() {
  for (int i = 2; i * i <= 2000; i++) {
    if (!vis[i]) {
      for (int j = i * i; j <= 2000; j = j + i) vis[j] = 1;
    }
  }
}
int main() {
  long long int n, q;
  cin >> n >> q;
  long long int b[40] = {0};
  for (int i = 0; i < n; i++) {
    long long int n1;
    cin >> n1;
    long long int po = log2(n1);
    b[po]++;
  }
  while (q--) {
    long long int k1;
    cin >> k1;
    int n1 = k1;
    int bin[40] = {0}, cnt = 0;
    while (k1 != 0) {
      bin[cnt] = k1 % 2;
      k1 = k1 / 2;
      cnt++;
    }
    long long int ans = 0;
    for (int i = 39; i >= 0; i--) {
      if (bin[i] != 0) {
        if (b[i] >= bin[i]) {
          ans += bin[i];
          bin[i] = 0;
        } else {
          ans += b[i];
          bin[i] = bin[i] - b[i];
          if (i != 0) {
            bin[i - 1] += 2 * bin[i];
            bin[i] = 0;
          }
        }
      }
    }
    bool f = 0;
    for (int i = 39; i >= 0; i--) {
      if (bin[i] != 0) {
        f = 1;
        break;
      }
    }
    if (f)
      cout << -1 << endl;
    else
      cout << ans << endl;
  }
  return 0;
}
