#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
long long hashval[32];
long long getexp(long long val) {
  long long ans = -1;
  while (val) {
    ans++;
    val /= 2;
  }
  return ans;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  long long n, q, b;
  cin >> n >> q;
  vector<long long> v(n);
  for (int i = 0; i < n; ++i) {
    cin >> v[i];
    hashval[getexp(v[i])]++;
  }
  while (q--) {
    long long ans = 0;
    cin >> b;
    for (int i = 31; i >= 0 && b != 0; --i) {
      if (hashval[i] <= 0) continue;
      long long k = b / (1 << i);
      if (k > hashval[i]) {
        ans += hashval[i];
        b -= hashval[i] * (1 << i);
      } else {
        ans += k;
        b -= k * (1 << i);
      }
    }
    if (b != 0) ans = -1;
    cout << ans << "\n";
  }
  return 0;
}
