#include <bits/stdc++.h>
using namespace std;
map<long long int, long long int> mp;
long long int n;
long long int a[] = {
    1,         2,         4,         8,        16,       32,       64,
    128,       256,       512,       1024,     2048,     4096,     8192,
    16384,     32768,     65536,     131072,   262144,   524288,   1048576,
    2097152,   4194304,   8388608,   16777216, 33554432, 67108864, 134217728,
    268435456, 536870912, 1073741824};
void solve(long long int input) {
  cin >> n;
  long long int b[n];
  long long int q;
  cin >> q;
  for (long long int i = 0; i < n; i++) cin >> b[i], mp[b[i]]++;
  while (q--) {
    long long int ans = 0;
    long long int x;
    cin >> x;
    long long int i = 30;
    while (1) {
      if (i == -1) {
        break;
      }
      long long int k = x / a[i];
      if (k == 0) {
        i--;
        continue;
      }
      if (mp[a[i]] >= k) {
        ans += k;
        x = x % a[i];
      } else {
        long long int z = mp[a[i]] * a[i];
        ans += mp[a[i]];
        x = x - z;
      }
      if (x <= 0) {
        break;
      }
      i--;
    }
    if (x != 0) ans = -1;
    cout << ans << "\n";
  }
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long int x = 1;
  for (long long int i = 1; i <= x; i++) solve(i);
  return 0;
}
